Having problems with your Compaq Presario SR1120NX 2.66GHZ Tower w/ CD-RW (2018267632) PC Desktop ?

I need a manual or product number for power supply power supply order #


Answers :

The Power Supply used in a Compaq Presario is a 250 Watt model.
The shape of the power supply, is one that is used in over 90 percent of personal computers.

ATX (ATX12V)

Should you put - Compaq Presario SR1120NX power supply - in your browser search box, you will come up with many search hits. Mostly generic, cheap quality, power supply's that are 250 Watt, or an upgrade to 300 Watt.

I would like to dissuade you from purchasing one of these.
Why?
Because the hardware components used inside these type of power supply's, are of low quality. Won't be long, and you'll be purchasing another power supply.

A failing power supply can mimic issues that seem software related, unless the power supply fails all at once.

Cheap quality power supply's have,
1) Inferior quality Electrolytic Capacitors. The Electrolytic paste inside develops a gas, and paste loss ensues.

2) Inferior gauge, (Size), of wiring. The wiring is smaller than the circuit requires.

3) Inferior Rectifier Bridge. The Diodes used in the bridge are of an inferior quality

Thesedare just some of the components that are less than. If you pick up a cheap quality power supply, and a quality power supply, you can actually feel the difference in weight. The quality power supply is heavier.

Also. A computer only uses the power it needs. Period. If you install a power supply that has Much more wattage than needed, it would do no harm to your computer.

Example: Your computer came with a 300 Watt power supply. You install a 1000 Watt power supply. If the computer only needs 100 Watts, it only uses 100 watts.
(Surfing the internet typically uses 100 Watts. Same energy used as a 100 Watt light bulb)

A power supply should have 10 percent more power than will be needed, when operating the computer at a maximum load. Gives the power supply a 'Cushion', and doesn't strain it. Therefore the longevity of the power supply is increased.

This is why I would recommend a decent quality, 400 Watt power supply. Secondly I would recommend a 400 Watt power supply because of the price. Follows the 'Best Bang for the Buck' theory.

[It's more than a 10 percent increase, but the ratio of added power plus the cost factor, makes a 400 Watt power supply ideal]

The following example is just that. An example. It is not an advertisement for the power supply manufacturer, nor the website.

1) OCZ StealthXStream 400 Watt

http://www.tigerdirect.com/applications/SearchTools/item-details.asp?EdpNo=4675269&CatId=1078

This power supply has a 80 plus certification. Meaning it can reliably put out 80 percent of the stated maximum rated Wattage, all day, every day. 80 percent of 400 Watts is 320 Watts.

(The power supply that failed in your Compaq had a 60 percent rating at best. This means that 250 Watt power supply was only capable of producing 150 Watts!)

The OCZ power supply has a 140mm fan for cooling the unit.
A larger fan means it turns slower. Less noise is produced.
Can produce more air turning slower than the 80mm fan in your old power supply.

Has all the power cables you'll need.
I will post in a comment about the power cables you'll need, where they go, and what they look like.
Plus how to replace a power supply in your computer.


No you don't. If you think the power supply is bad, then unplug it, unscrew it, and take it to a discount place like Fry's to simply match it. Compaq does not make its own power supplies, so they use generic ones, like everyone else does. The only thing you have to choose is how many watts you need. The original may have been rated too small if it went bad, and you many want one with more power, like 500 watts.
Repair Help & Product Troubleshooting for Compaq Presario SR1120NX 2.66GHZ Tower w/ CD-RW (2018267632) PC Desktop

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