Fedora 17: Freezes completely on a regular basis

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http://forums.fedoraforum.org – Problem: Fedora 17 64bit freezes on a regular basis no matter what programs I use. I suddenly can't move the mouse curser, everthing freezes and the display turns off and on again. When a song or a (Youtube-)video is playing, the video freezes too but I can still here the sound. ==> I have to push the reset button on my computer or hold the power button. It is very annoying especially when I have important documents opened and not saved.. Things I've figured out: * Same problem on Ubuntu and Fedora 17 xfce spin. (These are the two linux I've tried besides the gnome 3 version) * Problems on (HowTos)