Lately I've been having a problem with computer not wanting to restart or turn on from a cold boot. The fans will turn on and it sounds like everything is running but I get no usb power or monitor connection. Sometimes after it boots it'll hang up and I'll have to turn it off and wait again. The waiting process can take a long time. I've waited ffor 7 hrs for it to turn on after a cold boot. Like I said, the fans are powering on but no display or usb power. My systems specs are Windows 7 62 bit, AMD Phenom quad core, 8gb ddr3 ram, nvidia geforce gtx660, and 600w psu. I have the stock Asustek cm1630 mobo.
One thing about this problem is that once the computer actually boots up, I have no problems until I have to restart it again. So the computer is still definitely fully functional after it gets past the hang on the initial boot.