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I have an ACER AM5640 and it does not start. The lights on front blink, the CD/DVD drive spins, the cooling fans run, but it does not boot. I created a LINUX bootable CD and tried starting from that, but nothing happened. I am wondering if the hard drive has totally stopped or the BIOS is fried. Someone told me that I can update the BIOS by using a USB memory stick, but I do not know how. Any ideas?


Answers :

ACER am5640- blue light on, fan, hdd,cdr speens but not display, mouse and keyboard. I checked PSupplay, the tension are there, replaced hdd and RAM, nothing happened. Help please.
1.Most of the time it's Power Supply related.

The Power Supply has enough power to spin fans, and light - light's, but not enough power to run the processor.
(You may even hear the harddrive sitting there spinning)

A.All the lights use less than 1 Watt.

B.Each fan uses 2 to 3 Watts.

C.Harddrive sitting there spinning uses about 2 Watts.

D.Processors use 55 to 125 Watts! Depends on the processor.

Acer made different versions of the AM5640.
Could be the,

AM5640-U5401A (Uses Intel Pentium Dual Core E2160.
1.8GHz)
65 Watts for the Desktop versions.

AM5640-E5407A (Uses Intel Core2 Quad Q6600. 2.4GHz) Depending on which version, 95 to 105 Watts.

AM5640-U5403A (Uses Intel Pentium Dual Core E2200. 2.2GHz) Uses 65 Watts.

Most of the time pre-built computers come with a cheap power supply. Saves the computer manufacturer money.

Also if the inside of the computer, plus the power supply is dirty, this will cause power supply failure.
(As well as all the other components inside the computer. Dust is a STATIC electricity 'magnet'. It can create a path for electricity where a path shouldn't be!)

Not enough power to run the processor, then the harddrive is just going to sit there, and spin.

2.Electrolytic Capacitors on the motherboard.

When these fail the computer goes down quick!
Won't boot up, and/or stay running.

Capacitors that surround the Processor are Voltage Regulators. They ensure a clean, steady supply of DC voltage. If just ONE is bad, the processor will not run! These are usually the ones you see rated at 1000uf or higher. (uf = MicroFarad)

This link gives you an idea of what Electrolytic Capacitors look like on your motherboard, and possible signs of visual failure,

http://www.capacitorlab.com/visible-failures/index.htm

It IS NOT an invite to replace Electrolytic Capacitors!
Even after the computer is unplugged from power, these capacitors can hold a charge for weeks, sometimes MONTHS!

Electrolytic Capacitors are designed to build up a certain amount of charge inside, then release it all at once. (A flash on a camera is an example of this)

If your fingers touch the two terminals on the bottom of the capacitor, at the same time, YOU could be the recipient of that charge! (Or if you touch the + terminal, and you are grounded)

If your fingers touch, and complete a circuit that one, or more capacitors are in, YOU could be the recipient of that charge!
BAD shock to FATAL!

[For this reason NEVER open a power supply! The Electrolytic Capacitors are larger in size. {Capacitance. Hold more Voltage)

The above link is for informational purposes only, so that you may be able to diagnose your problem better.

Regards
joecoolsvette
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