Hello! I have this problem with my PC. I swapped in a new mouse.My PC was in sleep mode.It didn't want to go out from sleep, so I pressed the power button for a few seconds, and the PC shuts down. But,when I tried to power it back on, it won't post.Fan spins, my LED fans spin. I took the CMOS battery out. It boots to the log on screen,but suddenly screen turns black, no nothing. Fan spins as usual.Anyone knows what is wrong and how to fix it? I'm running Windows 7 Ultimate 64 bit.