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PC powers on but no Post beeps


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#1 possumbarnes

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Posted 06 March 2012 - 06:00 PM

I had a client bring me a computer today and I think it's just a paperweight now. Just want to post on here to get second opinions.

It's an eMachines W5243 desktop. It powers on as soon as you plug the power cable in. You cannot turn it off using the power button on the front. It has to be unplugged to turn off. When it does power on, there are no POST beeps while booting and no video at all.

Here's what I've done:
Tried a different power supply.
Tried a new video card.
Tried booting up with everything unplugged (DVD and hard drive).
Tried booting up with no memory installed.
The only card installed was a modem. I removed it and tried to boot.
I disconnected the power switch and front lights, and it still powered on as soon as I connected the power cord.
I know the monitor works because its the same one I'm using right now.

With each of these steps, the PC did the same thing. Just powered on, no beeps at all, and no video. If it was actually trying to boot up, I would expect to hear some beeps when everything was unplugged, right?

I think I've ruled out everything except the mobo and CPU, and I don't have the capability to test those at all. Since the client doesn't want to put more than $100 into it, I've got to tell him its dead.

Does anyone here have any other ideas that I haven't tried?
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#2 rotor123

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Posted 07 March 2012 - 11:25 AM

Hi

One thing I'd do is take a look at this page for how to tell, and see if the motherboard has bad capacitors.
http://www.badcaps.net/pages.php?vid=5

Other than that I will say the older eMachines had a tendency to go dead with both a bad power supply and bad motherboard.

When it is powered on, after a minute or two being careful, defective motherboards can get hot enough to give a burn from some parts. See if anything gets really hot, That would be a bad sign as would bad capacitors.

The difference is that bad capacitors can be fixed fairly easy using advice from the badcaps website.

I just fixed a video card last week by replacing five bad capacitors.

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#3 red_devil028

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Posted 08 March 2012 - 10:18 AM

Rotor is right...

Please check the capacitors... however, a few tests can be done still.

First of a new PSU can be put on, if the pc don't boot anymore because of that this might be a solution as well...

Also: try to replace the memory. usually when a pc does not beep when there is no memory inserted. so that could be dead too if the capacitors are ok
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#4 hamluis

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Posted 08 March 2012 - 12:04 PM

<<...usually when a pc does not beep when there is no memory inserted...>>

Hmmm...not true, IMO. Removal of RAM should spark beep codes if MB/system is healthy.

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#5 possumbarnes

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Posted 08 March 2012 - 04:43 PM

The 2nd thing I tried was a new PSU.
Inspecting the caps showed me nothing. They all look good. No bulging or leaking and all look secure to the mobo.

I've never seen a mobo boot up without beeping like it has gone mad if a hard drive and/or memory are not installed.

I think this thing is scrap since he put a $100 price limit on it. Thanks for the help, guys.
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