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Delete the plug and play monitor driver and reboot. Trouble is this worked for only one day and had to be done the next. Wish I knew a permanent solution. It appears to be a driver issue. Will see if I can reload the monitor specific drivers instead of plug and play.
Do you have your screen saver enabled, i so turn it off and se if it still does it.
Secondly boot your pc in safe mode(pressing F8) on boot up and select start windows in safe mode.
See if the monitor still does it, if so a monitor fault or loose/faulty vga lead.
If it is ok then your graphics driver may be corrupt and need re installing.