Is my motherboard dead?

May 20, 2011 at 19:04:10
Specs: Windows 7
The problem I'm having is that my PC won't boot up. It gets past the bios and begins loading windows, and a few seconds into that it restarts, and does this loop of restarting endlessly. I've already reformatted my HDD, and I've also plugged the hard drive into another computer and it booted up fine. On top of that I've siwtched out PSUs, and also ran a memtest and the RAM is fine. So I think I've narrowed it down to either the motherboard or processor, unless there's something else I'm missing.

Another thing, when I tried to reformat it, everytime I tried to boot from CD it gave me "Cannnot boot from CD, Error 5" or something along those lines. So I had to reformat it with the Hard drive plugged into a different PC. Also before this problem occurred, my brother was using it and tried to install a new video card without turning the PC off, and right around that time was when it stopped working, so I'm not sure if something like that could be the cause of this.

Anyway, any advice would be awesome, if anyone knows a solution let me know!

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May 20, 2011 at 19:59:06
Swapping memory chips with the power supply plugged in (computer off) is enough juice to fry the mainboard and memory sticks. Not only does it have to be off, but all electrical sources removed as well (I/O cables to anything).

Since you've already swapped CPU's, that part MAY be OK. Good parts in bad units usually makes the good parts bad.
I'd start over with new parts. Give the old PC parts to your brother.

It sounds like the memory controller chip has failed - cannot get out of real mode into virtual mode. It will make a good DOS machine.

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May 20, 2011 at 22:12:17
usually if a mobo gets past post i would suspect it to be ok, and i think i read that you formatted via another machine but installed win 7 via this machine? try with only 1 stick of ram, try each stick seperately. and try running from vga if you have a onboard video chip, also try another video card.
make sure the setting for the drive setup in the bios are correct, maybe reset bios to defaults.
then start buying new parts.

i hate computers!
but cant help myself....

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