Start in Safe Mode:
Tap F8 at startup, select Safe Mode and proceed.
Go to Control Panel > System > Device Manager and delete the entries under display adapter.
Reboot letting Windows reinstall the drivers and hopefully solve the problem.
You can also try restoring the registry:
Boot up with a start-up floppy disk and at the A:\> prompt type
C: (press enter)
cd windows\command (press enter)
Your prompt should read C:\Windows\Command, correct?
scanreg /restore (space between g and /)
Press enter, select a date PRIOR to the problem, press enter, wait for the process to finish and reboot WITHOUT the disk.
If you don?t have a start-up disk, download one from www.bootdisk.com.
When I start my machine, I get a flashing screen which only stops when the Windows XP login screen appears. The monitor also flashes when you try and load the BIOS. I am sure that this is a frequency issue however I do not know how to rectify it. My Graphics card is an ABIT Radeon x600 Pro Guru and monitor is a CTX 19" Flat Screen (S962A) Any help will be greatly appreciated!