Go to the device manager and roll back the video driver or whatever device has a red or yellow warning icon.
Reboot and see if that corrects the problem.
If no joy -
If you can now get to System Restore in eityher safe or normal mode do so and reset your system state for a date that preceeded the problem.
If that doesn't produce the desired result reboot to last known good configuration.
Edited by Enthusiast, 15 October 2006 - 02:18 AM.