CPU won't turn on

Acer Aspire x3900
May 1, 2010 at 16:44:39
Specs: Windows 7
My CPU (the tower part) doesn't turn on. YES it is plugged in and my monitor is plugged into the same outlet so I know its not outlet failure. The blue light is not coming on and I can't even turn it on so I can't use that computer. I am at my Cousin's house typing this and viewing the stuff on my iPod after. Please help!! I tried the 30 second thing and the temperature thing not working and there is no viruses on my computer FACT

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May 1, 2010 at 18:07:34
"My CPU (the tower part)"

Nothing pisses a computer guy off more than someone referring to their tower as a CPU. A CPU is a socketed chip that plugs into a motherboard. Here's an example:


"I tried the 30 second thing"

Have no idea what that is...

"and the temperature thing"

Don't know what that is either...

"and there is no viruses on my computer FACT"

And how would you know any of this if you can't even turn it on?

You *probably* have a bad power supply.

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May 1, 2010 at 18:57:05
First thought is the powersupply has failed. That may not be the problem or the only problem but it is a starting point.
A simple test would be to disconnect mains power, open the case, Disconnect all motherboard and drive power connectors.

Now on the main 20/24 pin plug, bridge from green wire to any black wire using a paperclip inserted into the sockets.

connect mains power and see if the PSU fan spins. If not the PSU has completely failed. A spinning fan is of course no guarantee the powersupply doesn't have problems. They put out several different voltages on different "rails" and the paperclip test does not tell if one or more of those has failed, but it is a starting point.

Goin' Fishin' (Some day)

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May 2, 2010 at 20:45:53
@Jam I know there are none as I do weekly
virus scans and Im not tech-savvy or
something like that as you... The 30 sec
thing from Acer help site and temperature I
read here about how some computers can't
start if its too cold/hot

@Richard59 not power failure fact. Easier

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May 3, 2010 at 15:57:29
"not power failure fact"

Have you ever opened up a PC case and looked at the internal components? You say in your initial post that it isn't power OUTLET failure and I believe that, but if you get absolutely no response when pressing the start button on the tower then the logical suspect is the tower's internal powersupply. That is the box with all the wires coming out of it that converts mains AC power into the various DC voltages that the rest of the computer needs in order to run. I would be prepared to bet that yours has failed.

But, if you have tested the powersupply and proved it is not faulty then that leaves motherboard or CPU failure.

Unless you have a supply of known good compatible components that you can swap in/out in order to test & identify what has failed then I suggest you take the system to a qualified tech for assessment.

Goin' Fishin' (Some day)

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May 3, 2010 at 20:23:51
No im only 11... I cant open my PC or i'll get introuble any
ways to fix this?

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May 3, 2010 at 20:33:48
The monitor has power going to it separately from your computer tower.
It looks like you have a computer crash?

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