emachine turns on but no nothing

June 17, 2014 at 22:38:29
Specs: Windows 7, celeton440 2ghz
power supply good volts,tried another cpu pentium 4,tried the celeroncpu in other mother board ,no luck

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June 18, 2014 at 04:50:44
"power supply good volts"

Just because you have the proper voltage(s) doesn't necessarily mean the PSU can supply the proper amperage(s). eMachines are notorious for having poor quality PSUs, usually Bestec units. My guess is that's where the problem is. You're most likely wasting your time by swapping CPUs.

message edited by riider

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June 18, 2014 at 12:48:48
ok ,but why my processor does nothing on the other mother board of a friend,no signal on the supply of capacitors,(i use the osciloscope to see the the turn on signal),but i will try to test my power supply in the other mother board to se what happens.i have tried another ps but witha smaller connector ,its the same and tried in the other mother board and turns the proccesor of mifrien on but not mine.a day after the pc broke the cpu fan was spinning very fast and slow rapidli chanching speed and sudenly turned off the pc.found the fan clogged with dust and pet hair.

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June 18, 2014 at 14:54:44
It is easy to disturb connections when cleaning - make sure they are all firmly pressed home. Clean any edge connectors (including RAM) with a pencil eraser and plug the components in and out a few times to ensure there is no oxide on their sockets.

Always pop back and let us know the outcome - thanks

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June 18, 2014 at 16:50:58
The initial problem you describe is almost always either the PSU, motherboard or both (since a bad power supply can ruin the motherboard as well). Your CPU may not have worked in the other computer because it wasn't compatible with the motherboard or not configured properly on the motherboard. Or it might be bad too.

Also a psu may appear to be good in that when switched on the fans spin up, LEDs light up and drives spin but that's no guarantee its working. As already mentioned it has to provide several different voltages at sufficient current in order to be 'good'.

It's kinda hard to follow the disjointed troubleshooting comments in your # 2

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June 18, 2014 at 22:14:08
the only thing is to find some friend with the same cpu and power supply to rule out motherboard,cpu or psu.i have disconnected the hard drive ,ram;the video is built in so no luck

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