Desktop PC won't boot

February 7, 2011 at 06:45:44
Specs: Windows 7 64bit Home Pr., AMD / 4GB Crucial
Hello all. About a month ago I was installing a notebook HDD in my desktop in order to pull files from it. I couldn't find my extra SATA cable, so I decided I could quickly and easily take the one running to my case's front panel e-sata slot and use it. This was much tougher than it appeared because of how it was routed through the case. When I finally got it connected I tried powering on, and had no luck. I went into melt down mode disconnecting everything and going through fault isolation, all to no avail. Finally I ran the SATA cable back to the front panel, and put everything back together the way it was. Still nothing. (MOBO Standby light, but when power button was pressed, nothing happened). Unfortunately I was needed elsewhere for a while, and stopped messing with it. After an hour or so, I came back, and before I dove back in, simply pressed the power button again... IT WORKED. I thought the problem was over, until the workstation was powered off again, and wouldn't boot yet again. This time I waited about 20 minutes, and tried again; it worked. So, here we are. I've never heard of anything like this, and although I'm not a computer technician/engineer, I have put together many builds, and understand most hardware concepts.
Key components:
Athlon X2 4200
Silverstone 600W Modular PSU
CoolerMaster Storm Scout case

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February 7, 2011 at 09:07:08

Ok. So for some reason my trick of leaving the computer plugged in for 20 minutes before trying to power it on no longer works. I can't get a response at all. I've disconnected everything but the CPU/HSF and 1 DIMM, and even tried booting with direct contact to PWR Switch pins. I'm getting no response. Motherboard SB Power is still on.

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February 7, 2011 at 10:09:20
Update again.
Well, it looks to be the motherboard at this point. I was able to jump the PSU and get it to fire up and power the HSF and case fans. Looks like the motherboard isn't returning the boot signal. Maybe a mobo short? I'm about to remove it entirely from the case, clean, and inspect everything.

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