Just figured I would share the problem I see many people are having. After installing windows 8 pro upgrade all seemed to work just fine. Got my games reinstalled, checked all drivers, and installed all 4-5 windows updates. Restart time. Computer restarts to a black screen while sometimes showing the log in screen for about 5 seconds before cycling through this problem again. Shows monitor turns off and on the boom black screen with cursor. I have tried multiple fixes on the net but none worked. Then I uninstalled the windows updates from earlier and seems it fixed my problem. I have restarted multiple times with no problems yet. Maybe this will help someone out there that is ready to pull there hair out.