Fried Motherboard?

[historyfend13]

So, I have a slight issue.

My computer had been freezing after leaving it sit for longer than 30 minutes and would require a restart. Yesterday I come home and it had again frozen. I went to go and restart it, and holding in the power button wouldn't turn it off, so I had to flip the switch on the PSU. I tried to start it, and nothing. I tried to re seat the cpu, move the ram, try some back up ram, and had everything unplugged but the ram, cpu and monitor and it still won't post.

My hardware:
AMD Athlon II X4 620
Gigabyte GA-MAGMT785-UD2H
Corsair DDR3 Vengeance 8gb 1600mhz
WD Cavier Blue 320gb HDD
HIS Radeon HD 4850 512mb
Antec Basic Plus 550W PSU

[wibeasley]

I'd pull the motherboard out of the case and try a minimal setup that sits on cardboard. Do you have a backup PSU?

Can you link to that motherboard? I can't find that model number anywhere.

[historyfend13]

Oops I typed it wrong.
It is a Ga-MAMA785GMT-UD2H

http://www.gigabyte.com/products/produc ... id=3274#ov

[wibeasley]

It's nice you won't need the discrete card to test if it POSTs with a minimal configuration.

[just brew it!]

I'd say 50/50 odds between it being the motherboard or PSU.

OK, maybe more like 48/48 odds, with the remaining 4% being "something else".

[historyfend13]

When I had the video card in, I know the psu works because the fans and dvd drive still turned on. And when I unplugged the video card, it still turns on, but there is no video coming out of either the video card or igp. Also, there seems to be no usb power and the network adpater does not show any activity.

So the psu still seems okay as well as the video card, but idk if it is the mobo or cpu. And with nlo video or usb it is hard to analysis.

[just brew it!]

When I had the video card in, I know the psu works because the fans and dvd drive still turned on. And when I unplugged the video card, it still turns on, but there is no video coming out of either the video card or igp. Also, there seems to be no usb power and the network adpater does not show any activity.

PSUs have multiple rails. They don't necessarily all die at once.

So the psu still seems okay as well as the video card, but idk if it is the mobo or cpu. And with nlo video or usb it is hard to analysis.

Unless this system was heavily overclocked, a fried CPU is very unlikely.

[mnecaise]

I know the psu works because the fans and dvd drive still turned on.

I hear what your saying, but unless you have the tools to measure all the voltages, including the AC component, try swapping the PSU. Borrow one if you have to. Try this before you spend money on a new board.

As someone else pointed out there are multiple rails. One out of spec rail can keep a machine from booting, but simce the primary rail is the 12V rail, if it's ok the fans will run and the drives may spin up. My current machine became unstable and I found there was excessive AC on all the rails and the voltages were borderline low. Replacing the PSU solved the problem and its been rock solid since.

[wibeasley]

And when I unplugged the video card, it still turns on, but there is no video coming out of either the video card or igp.

Why would it come of of the video card? Was it still inserted into the PCIe slot?

Also, there seems to be no usb power and the network adpater does not show any activity.

I suspect that stuff isn't initialized before the POST anyway.