Having problems with your PC Desktops ?

I am working on an HP Pavillion a1220n Desktop and I am getting different bootups each time. First we had a visual (video), but when we enter bios, the computer would not freze up, but simply just reboot itsself, and it would reboot everytime by itsself, no matter where you were at from 15-20 seconds after booting up. So I removed the CPU/FAN and Heatsync and they were covered with dust, I cleaned the dust off, and plug it back in, and now when I turn it on, the fans are running in the back, b


Answers :

You didn't break the computer, They did.

(EDIT: This is a long solution. I detailed it out, because I thought you would want this knowledge. I apologize for the length of it, however)

Computers MUST have the inside cleaned out on a regular basis, and also the power supply.

The frequency of cleaning, depends totally on the environment the computer is in.
A person can be the best housekeeper in the world, but dirt, dust, hair, lint, carpet deodorizer, and other foreign materials are drawn in with the air.
It accumulates over time.

When a Processor becomes too hot it is turned off. BIOS turns it off.
This is a Fail Safe feature that is built in. Keeps the Processor from burning up. (Sometimes Literally!)

Cleaning the Processor's top case, and the bottom of the Heatsink.
I have to ask. Did you use anti-Static guidelines?

Computer unplugged from power, of course, but did you touch the metal frame of the open computer case, to relieve your body of Static electricity?

This is Especially noted when touching a Processor, even if it's just the top of the case. Processors are Very Susceptible to Static shock.

Are you sure the top of the Processor's case, and the bottom of the Heatsink is clean? Must be Thoroughly clean!
I use an old plastic credit card, and Q-tips dipped in Isopropyl Alcohol. (Rubbing alcohol. 91% alcohol)

Fresh thermal paste MUST be applied.
If there is a Thermal Pad instead of paste, take it off, use it for a miniature Frisbee. They are JUNK!
(Do NOT reuse a thermal pad in any instance. It will not work twice)

The surface of the top of the Processor case, and the bottom of the Heatsink has imperfections. These are not readily seen by the human eye.
These voids will trap air, and air is an Insulator, not a Conductor.

Thermal paste fills these voids, and helps transfer the heat from the Processor to the Heatsink. It's better to have low quality thermal paste, than to have none at all.

The inside of the computer needs to be cleaned THOROUGHLY. Sometimes this takes a Lot of Q-tips, and a can or two of compressed air for computers.

[I have cleaned many a desktop computer that has dead bugs, and spider webs inside, along with dust bunnies you could grow a garden in!
Dust is a Static 'magnet'.

It can hold Static. Static will fry out the delicate computer hardware components!
The dust can also contact connections inside the computer, transferring electricity from one area, to another area, where it Shouldn't be! ]

From your diagnoses the Power Supply is bad.
Has a bad Voltage Power Rail.

When you press the Power On button, you are making a momentary contact. (The Power On button pushes against the power on switch, which is a Momentary Contact Switch)

This creates a brief circuit. A 5 Volt circuit. 5 Volts goes to the Soft Power On side of the Power Supply, and turns it on.

The BIOS program is turned on. BIOS 'sees' what devices are installed, does a Ram Memory count, turns the Processor on, and hands the computer over to the Operating System.
(Windows XP is an example of an O/S)

You don't even have enough power to keep the BIOS program going.

Power Supply
The Power Supply for the HP Pavilion a1220n Desktop PC, has three main Voltage Power Rails.
1) The 3.3 Volt rail
2) The 5 Volt rail
3) The 12 Volt rail

Components inside the Power Supply have failed. The usual suspect are the Electrolytic Capacitors.
Electrolytic Capacitors are used in the Input Stage of the Power Supply, and the Output Stage.

AC electricity comes into the Input Stage. The Output Stage is the rectified AC that is now DC.

http://en.wikipedia.org/wiki/Switched-mode_power_supply

Click on the photo at the upper right to enlarge.

For simplification in explaining Electrolytic Capacitor construction, lets just say there is Electrolytic paste inside.
[For a more detailed explanation type - Electrolytic Capacitor, into the search box on Wikipedia, and scroll down the page to the - Construction, heading. Also click on the links at the bottom]

When these type of capacitors start to fail, the paste develops a gas inside. The gas expands, and compromises a seal.
(Rubber round plug at the bottom of the capacitor's aluminum 'can', is pushed out slightly)

There is also a slight cut, in the top of the capacitor's aluminum case. (Can) This 'cut' breaks open when the gas pushes against it.
(X or lK shape cut)

Electrolytic paste is then pushed out. (It oozes out)
So much paste loss, and you have a weak capacitor.
Too much paste loss, and you have a failed capacitor.

This creates a weak voltage rail, or a failed voltage rail. (Voltage power rail)

ALL the lights use less than 1 Watt.
EACH fan uses 2 to 3 Watts
A typical Processor uses 55 to 125 WATTS.

There isn't enough power to turn the Processor on.
BIOS sees this, and turns the computer off.

When the cooling system of a Power Supply is coated with gunk, the cooling capacity of the cooling system drops tremendously.

(Fan on back of the Power Supply, and Heatsinks inside the Power Supply, are it's cooling components)

Heat = Wasted Energy
The Power Supply tries to keep up with the energy demands, and eventually components inside fail.

Replace the power supply. Make sure the inside of the computer is thoroughly clean. Be sure the Processor case top, and the Heatsink bottom, are Clean. Make sure fresh thermal paste is installed.

(Most computer repair shops, have a small tube for around $2 that you can buy. Just enough for one, or two applications. Use a small Pea sized amount.

Place on the middle of the top of the Processor case.
Place the Heatsink on top. The Heatsink will smush the thermal paste just right)
Now try to find out the problem and may be you need to replace some of the spares on your desktop
First of all get your motherboard manual ready to replace all the connectors in place once you finish the cleaning.
Clean your MB with vaccum cleaner by blowing away all the dust(put a face mask to avoid alergies) and a soft brush.
disconnect *********** board power connector and check the voltage or on blind way sort the forth wire(Green) and any Black wire with a small piece of wire (may be 2-3) inches) and now power on the socket you will find the fan at the rear of your SMPS running. If not then you have your SMPS unit faulty and need a replacement.
If your SMPS fan is running replace the connector Next remove your DIMM (RAM) and clean it with any cleaning liquid with 100% alcoholic base. wait to dry out fully and replace the ram. and power on.
Next reset your BIOS to default by removing the CMOS battery for few minutes and by sorting the jumper pin ( the connector to be sorted are mentioned in the MB nearer to the CMOS BATTERY).
Next you may need to flash the CMOS nomally the bios update you can find from the product manufacturers website download support page for your product. but for this you need an expert technical man who can do it for you or help you to do that.

hope this will solve your problem

All is Well
I am\015\012working on an HP Pavillion a1220n Desktop and I am getting different\015\012bootups each time. First we had a visual (video), but when we enter\015\012bios, the computer would not freze up, but simply just reboot itsself,\015\012and it would reboot everytime by itsself, no matter where you were at\015\012from 15-20 seconds after booting up. So I removed the CPU/FAN and\015\012Heatsync and they were covered with dust, I cleaned the dust off, and\015\012plug it back in, and now when I turn it on, the fans are running in the\015\012back, but there are no visual now, and the fans seem to run, but there\015\012are no visual lights saying that you have pressed the ''turn on''\015\012button, and now the machine simply wont boot. The machine never booted\015\012in the first place but it was atleast giving me a visual. I am thinking\015\012the powersupply or motherboard, but i have not tested the voltage of\015\012the power supply yet, but the motherboard has onboard video, unless\015\012theres a bad cable situation the p/s and m.b are my assumptions, but\015\012this thing was caked on with dirt and dust in the heatsync and fan area\015\012so I was wondering if the conditions (say the temperature) were getting\015\012too hot that it would auto shut down after a temp is hit? I am unsure I\015\012am asking if you guys have had any similar situation before like this?\015\012It will reboot itsself even in bios when it shouldn't be able to knock\015\012you out of bios and reboot the machine so I am assuming theres\015\012something else going on, never heard any POST beeps when the machine\015\012did have a visual, but there were no error screens either since they\015\012dont display ''diagnostic'' screens and when gettinginto bios it would\015\012not let you change anything with enough time to save, so i am wondering\015\012now that I ripped the heatsinc and cpu fan off and cleaned that if\015\012thats now why it don't have a visual? (it should not be the reason whyt\015\012theres no visual now though but the people who im working on the\015\012machine are accusing me of breaking their machine) so what ever it was\015\012not me that did it.
Repair Help & Product Troubleshooting for PC Desktops

Tips for a great answer:

- Provide details, support with references or personal experience .
- If you need clarification, ask it in the comment box .
- It's 100% free, no registration required.

Suggested Questions/Answers :

I am working on an HP Pavillion a1220n Desktop and I am getting different bootups each time. First we had a visual (video), but when we enter bios, the computer would not freze up, but simply just reboot itsself, and it would reboot everytime by itsself, no matter where you were at from 15-20 seconds after booting up. So I removed the CPU/FAN and Heatsync and they were covered with dust, I cleaned the dust off, and plug it back in, and now when I turn it on, the fans are running in the back, b


You didn't break the computer, They did.(EDIT: This is a long solution. I detailed it out, because I thought you would want this knowledge. I apologize for the length of it, however)Computers MUST have the inside cleaned out o ... PC Desktops

My Acer laptop seem t0 shut down for no apperent reason and it always has to be pluged in


It sounds like your battery may be dead or close to dead if your laptop has to be plugged in all the time. if there is a battery check meter on the battery, you can check the battery condition with that.\012unless it is a problem with your char ... Acer Aspire 3680 Laptop

No Sata, intermitantly just locks up and reboots on it's own.


Random computer reboots can be difficult to diagnose. Try the following:\015\0121) Check event viewer for messages that could be related. (Control Panel >Administrative Tools >Event Viewer) These could point you in the right direction. ... PC Desktops

My computer keeps rebooting itself.


I would try taking to motherboard battery out for 10 minutes to reset the bios.....then try booting again.......if not then the bios could possibly be fried.....i had teh same problem with a computer i built myself...... ... HP Media Center PC 873n (P9875A#ABA) PC Desktop

Compaq desktop freezes on me when am working


Sounds like you may have a virus or spyware running in the background. When you turn on your computer, keep pressing F8 and it should take you to a boot menu. Choose safe mode and let it boot, if you can't get into safe mode without the lockups hap ... PC Desktops

HP laptop display issue


If you are recving 1 long and two short beeps, it is not a memory problem.\015\012It is not a Lid closing or lid switch problem.\015\012If you are able to switch to and from your LCD and Monitor, you are lucky. ... HP Pavilion dv6000z Notebook

I have a Compaq presario C500. It will not power on. When it is plugged in the lightning bolt icon on the side pulses on and off. When I press the power button and release it the power will flash for 3 seconds and go dead again. Any ideas?


Hello and thank you for using Fixya!\015\012\015\012· First troubleshooting - When you turn the laptop on, are you able to see the splash screen? This would be ... HP Compaq Presario C500t Notebook

My asus 900 will not start or turn on and I have it plugged, have checked the battery, everything appears to be connected correctly. Please help.


· First troubleshooting - When you turn the laptop on, are you able to see the splash screen? This would be the computer manufacturer's screen display that usually shows a ... ASUS Eee PC 900 Netbook

My hp wont turn on..the power light is on but its like my laptop is frozen or somethng


· First troubleshooting - When you turn the laptop on, are you able to see the splash screen? This would be the computer manufacturer's screen display that usually shows a ... HP Pavilion dv2000t 14.1" Notebook Laptop PC (Intel Core 2 Duo T5500 1.66 GHz, 1GB RAM, 100GB HDD, D... PC Notebook

My laptop will not power up. repeatedly pushing power button, but no response. Please help! Mark


Hello and thank you for using Fixya!\015\012\015\012\015\012First troubleshooting - When you turn the laptop on, are you able to see the splash screen? This would be the computer ... Sony VAIO VGC-RB52 PC Desktop

After my computer boots up it then keeps shutting off. It does this every now and again but now it's been doing this for three days straight. I can't get it to stay on and it's fully charged.


Hello and thank you for using Fixya!\015\012\015\012\015\012First troubleshooting - When you turn the laptop on, are you able to see the splash screen? This would be the computer ... Acer Aspire One Netbook 8.9" Notebook

Vaio fj270 wont boot to windows stuck with a blinking underscore


Hello and thank you for using Fixya!\015\012\015\012First, check and make sure there are no CD's in the CDrom player. Also, check an make sure there is no external storage devices, such as a flash drive, external, etc.\015\012 ... Sony VAIO VGN-FJ270/B Notebook

Toshiba Satelite A35-S1592 won't load XP. Toshiba screen comes up and then black screen.Tried booting from CD. No luck.


· First troubleshooting - When you turn the laptop on, are you able to see the splash screen? This would be the computer manufacturer's screen display that usually shows a ... Toshiba Satellite A35-S1592 Notebook

Screen went black during start up. - Sony VAIO VGN-FS640W Notebook


· First troubleshooting - When you turn the laptop on, are you able to see the splash screen? This would be the computer manufacturer's screen display that usually shows a ... Sony VAIO VGN-FS640W Notebook

No video on boot up!!


Have you tried to uninstall the vedio driver and reinstall it then let me know.go to my computer icon right click it > go to properties >hardware tab > device manager and check if there is any yellow mark showing.kindly do this in starting your compu ... Gateway 500XL PC Desktop

Dell Latitude D800 PC - Fan-2-CPU problem


There's a second fan beneath the keyboard, you need to pry open the top panel where the power buttons are, then remove 2 screws for the keyboard to come off. When I did this, I saw the second fan with dust blocking it. I used a vaccum cleaner and m ... Dell Latitude D800 Notebook

My tower had a virus/trojan horse AND IT DOES NOT START OR REBOOT


Too complicated when I read your post. Why not take it easy, and sort your problem step by step. Ok you said you have a virus or trojan. Why not try other free antivirus? Try to use Avira free with malwarebytes antimalware in combo. Its lite and a ki ... PC Desktops

I am trying to burn a DVD that is 1 hour and 49 minutes long and it will not burn correctly. On a DVD-RW it only recorded just a small amount at the beginning and also had music in the background. I tried a DVD-R and it would not work at all. It also seems that the video file is larger than what the DVD can hold but I am using 4.7GB (2hours).


Make sure you treat your blank CD-R's with respect.\015\012Scratches or dust may cause write errors! Handle the disc carefully when transferring it to the CD drive!\015\012 \015\012 \015\012\015\012 \015\012DMA & Auto Insert ... PC Desktops

Laptop turns on and off, no display


This could be caused by a couple of causes, the most popular are Malware attacks and Overheating issues with the processor. Just remember though that there could be permanent damage to the motherboard and no fix except replacement is going to work. I ... HP Pavilion dv6000z Notebook

Stuck on Compaq Screen and keyboard dead


I would take the cover off and reseat the memory, video card, and processor. Make sure your fan(s) are working too, and blow any dust out of it if you see a lot of build up. ... HP Compaq Presario SR1720NX (EL435AA) PC Desktop

Mesh Matrix 64 start up problem


I KNOW YOU HAVE ALREADY DONE SOME OF THE WORK BELOW BUT GO THROUGH IT AGAIN WITH ATTENTION TO THE COOLER STEPS.\015\012\015\012Your fan speeds up and slows down in response to temperature inside the computer. \015\012\015\012M ... PC Desktops

First system cmos checksum bad.. now laptop wont turn on


The Toshiba Satellite A210 computer is a piece of ****. I have only had my computer for 2 years and I am having the same problem. Everyplace that I have taken it to says that the problem is the CMOS battery. The CMOS battery is dead and needs t ... Toshiba Satellite Pro A210-EZ2203X Notebook

Dell Dimension 8400, no post. B and D amber.


GYGY diagnostic lights -- Memory is detected, but a memory configuration or compatibility error exists, and the 1-3-2 beep sound indicates the MEMORY test failed, which means one of the four memory has gone bad or the one of the four slots on the mot ... Dell Dimension 8400 PC Desktop

How to install windows OS on Samsung N128 netbook


My Windows XP installation has reached its half-life. (You do\015\012know that Windows has a half-life, don’t you? Every installation of\015\012Windows naturally degrades along a logarithmic curve until it becomes\015\012annoying, then ... Samsung N120-12GBK Netbook

Compaq presario 2500 notebook won't boot


... HP Compaq Presario 2500LA Notebook
  • Start your question with What, Why, How, When, etc. and end with a "?"
  • Be clear and specific
  • Use proper spelling and grammar
all rights reserved to the respective owners || www.electronic-servicing.com || Terms of Use || Contact || Privacy Policy
Load time: 0.8735 seconds