Why would MB try to start but not?

Ecs (elitegroup computers) P4m800-m7 mot...
November 3, 2010 at 14:06:03
Specs: Windows xp, Dual core/1G
I have a dual core system that is a few years old. It has a new power supply so I am confident that it is ok. when I hit the power button the case fan, ps fan both twitch but that is all. The power LED on the front stays on. I have had power switches fail so I just removed the lead on the MB and jumped the connection still the same result fans just twitch. I tried removing the ram, same. I am guessing it is a bad MB or bad CPU but not sure of the how to go about figuring it out now. Any ideas would be a great help.

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#1
November 3, 2010 at 14:18:30
It's probably the power supply. Since you said it's new, you should know the make, model, wattage & amperage specs? and how much you paid for it?

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#2
November 3, 2010 at 14:27:22
Without testing equipment that only a repair shop would have there's no way to pin down the cause other than swapping parts.

Don't assume it's not the power supply.

Check my # 2 here:

http://www.computing.net/answers/ha...

for some basic stuff to check.

Real men don't use AntiVirus; they just reformat


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#3
November 3, 2010 at 14:42:43
The power supply is a Antec true430. I think it was $60.

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#4
November 3, 2010 at 14:51:46
You might have been right about the power supply. I found any old ps and plugged it in and the fan started spinning when the power button was pushed so I guess the ps might be bad. Which sucks because it is was new.

Thanks for the help.


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#5
November 3, 2010 at 15:15:28
Sorry for the on going to posts. I replaced the ps with the old one, I plugged it in the same way and it still would not start. unplugged several items until it would start spinning the fans. the item that I had to uplug was the 4 pin ATX_12V1 plug. It plugs right into the motherboard.

Does this mean the MB is bad? or what? What does that power on the MB?


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#6
November 3, 2010 at 15:29:38
If it is the power supply, hopefully it didn't damage the motherboard.

Real men don't use AntiVirus; they just reformat


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#7
November 10, 2010 at 20:29:10
Like I said the motherboard will start the fans if I unplug the 4 pins power connector. but there aren't any beeps. Is there a way to check the mother board or CPU?

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#8
November 10, 2010 at 21:53:14
That plug gives some extra current to the cpu. Once or twice I've seen where disconnecting it causes the fans to spin up. I think it's a motherboard problem.

As I mentioned in # 2 above there's no practical way for a user to test the parts except for swapping them out, unless you take it to a shop.

Well I remember seeing some add-on cards on ebay that supposedly can diagnose a dead system. I've never tried them though.

Take a close look at the capacitors that (usually) are lined up alongside the cpu. They'll be little cylinders standing on end. Do the tops look a little puffed out like there's too much pressure inside? When they get that way the motherboard is on its way out.

Real men don't use AntiVirus; they just reformat


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