Custom Build Will Not Boot


Jun 2, 2012
I just build a computer with the following specs:
GTX 680
Seagate Barracuda 3TB 7200 RPM
ASUS Sabertooth 990FX
Rosewil RNX-N360PC
Corsair Vengeance 16GB 1600
AMD FX-8150 Zambezi 3.6GHz 8-core
LG 12X Blu-Ray Drive
PSU is Coolermaster Silent Pro Gold 1200W

First boot went fine. We started Windows 7 64-bit Home Premium installation and everything went smoothly. We got to the "computer naming" window and the window lagged. The computer shut off and now trying to turn it on results in a slight twitch in the fans (including CPU) and the computer will not boot any farther than that. The issue is not trying to boot from the hard drive, because we have tried booting without it. RAM is out of the picture too (tried booting with only 1 stick, in every different combination of slots). We have tried clearing the CMOS. My only misgivings are about the motherboard's ATX 12V power connector and the CPU. During first boot, the motherboard manual said it was OK to put only a 4 pin connector in this slot, even thought it was 8 pin (I put it in the correct position). When the CPU power is unplugged, all other fans, and parts power normally. So the PSU is ruled out. Is it possible that some thermal paste has leaked onto the CPU socket or connectors, and that is what is causing the "twitch" in the fans? Or is it possible that the ATX 12V connector is fried? The motherboard does not have any leaking or bulging cathodes.

Also, does the orientation of the CPU fan have anything to do with this? Currently, the tab for tightening the fan is facing towards the top of the computer, should it be facing downwards?


Feb 25, 2012
although that seems to be a quality CollermasterPSU, i would suggest swapping out your PSU with a friends/family members PSU juuuuust in case. Also, how did you apply the thermal paste when you first applied it? if it was applied wrong, it might have leaked.