Black Screen appears only on Restart.

Hi to all EightForums. today I installed Windows 8 64bits Pro with mediacenter. my problem is very familiar, black screen appears. but its appears only when I restart the computer. and in one thing I m in luck that in black screen if I simply press the power button (which I set to shut down) computer going to shut down and on pressing again its start normally and desktop appears only in 5...