Motherboard, CPU or what? Help please?

[Mikelly]

Hello, you experts and aficionados! Here's the problem, and hoping someone can advise.
I'm no power user my PC has a Gigabyte GA-7N400 board and Athlon XP 2600, running WinXP. 512 meg ram. The usual HDD and DVD burner setup.
Okay, the PC has stopped working. I think I might have zapped it with a careless on-off switch via my Tevion TV card. Only maybe - I don't know.
Be that as it may, here's the symptoms:
* At switch on, the front green LED lights up and stays on, but the red light comes on then goes straight off.
* At the same time, the PSU fan starts momentarily, then stops. The CPU fan does the same.
* The little LED light by the RAM comes on and does stay on.
* No HDD, ditto the DVD drive.
* The PC don't work. No POST, nothing.
* I tried the DVD in my old W98 box and it works okay. Ditto the HDD, but of course I can't read it with FAT 32.
* Interesting point, there is just one item that does work in the PC, and that is the 'go-to-sleep' function. As per manual, if the 'start' button is pressed and held for four seconds then the green LED goes out. Press it again and it 'wakes' and the startup initiates - but stops as described above. Does this indicate that the board is maybe okay?
Is the PSU maybe controlled by the CPU or the board? That could explain why the PSU fan starts and shuts off again.
My guess is that the CPU is zapped.
So, anybody got a clear opinion, please? If a new CPU or whatever is needed, okay, but will that be all? The thing is, I read on this forum and elsewhere about people who are more used to all this than me, and some of them have real problems. First they buy one part, then another, and ends up they might as well have junked the beast and bought a new box. Argggh! Luckily, I still have my earlier old PC, otherwise I'd be stymied, as I live out in the country.
All comments gratefully considered. Please?

[sulusulu]

Welcome to TechIMO!!!

First ensure that the 12v power connector is pluged into the motherboard. (upper left hand coner according to the manual) If not plug it in and try again. If so continue reading. This sounds like it "could" be an electrical short. It's posible that it could be caused by other things, but a short can cause perminent damage and the others I can think of don't so this should be eliminated first.

You will need to remove all of the PCI/AGP cards and all of the cables connected to the motherboard and then the motherboard. Some cases have the motherboard stand offs built into the case, if so, you may need to cover/surround them with electrical tape or paper washers. Also inspect the motherboard and case for anything that might stick out and come in conntact with the case/motherboard. Insptect all of the compasitors on the motherboard to see if any of them are leeking or are bloated. (compasitors look like batteries) If the compasitors are leeking or bloated the motherboard is done for (unless you know someone who can fix it for you). Next reinstall the motherboard, video card, motherboard power connectors, and keyboard. Try turning it on. If it works reinstall your other hardware one peace at a time and see if it boots up ok. If it doesn't work try resetting the BIOS (be shure to unplug the computer when you do this). If that doesn't work try a different video card if you can.

If you want to take some risk and maby save som time you can fist remove the power cord. Let the somputer sit for about 30 seconds then turn the computer on without the powercord pluged in. Plug the computer back in and see if it works. If not, then reset the BIOS. Then remove all of the PCI cards and see if it works. (At your own risk)

I have the GA-7NNXP. It's a similar model and somtimes has "isues" related to power. Also the dual BIOS can somtimes be over sensitive, so be shure that both BIOSs are the same version and same settings. (at least settings that you know to be safe)

I'll be going to bed very shortly so I won't respond anytime soon. Please post back with you results. Good luck!