I had a motherboard from Asus that had some interesting problems similar to that...
(it was a freak of nature - I don't blame Asus, Asus is good)
So I get the motherboard, wire it up, and turn it on - nothing happens. I mess with every manner of cable, still nothing. Fans come on, nothing else, no beeps or VGA signal. The last thing I try is swapping the RAM for an identical module bought for, basically, another identical system. All of a sudden it boots! I figure, ok, dead RAM stick, I'll just have to exchange it.
Nope. Then I can't find the RAM stick. I eventually find it was in the other kid's computer, and he's been playing Call Of Duty all day with it and no crashes. Hmmm. A week later, after windows and a compliment of programs have been installed, and the computer is in its new home, the case gets bumped by a chair, and the computer locks up and reboots. Ok, that's odd... I find, through some testing, that I can make the computer lock up by bumping the case. And I'm talking, the kind of bump you might give it if you're idly swaying your leg back and forth while you're thinking, and it bumps the case accidentally.
Quite a while later, I find that if I push slightly on the floppy drive connector while the system is on, the system locks up. It was a non-fatal intermittent connection on the board the whole time. Replacing the RAM stick had wiggled the board a bit and "fixed" the loose component/wire/trace/whatever on the board. Bumping it and pushing on the floppy connector were causing signal interruptions because the loose connection was moving around. It was the first time I've ever seen a motherboard with intermittent contact on it - bloody hard to track down too.
Anyway, try what I tried - push on that connector while the PC is running. See if it freezes. My board was an A7N8X, just in case yours is too.
Thanks for all the help in advance again.
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