Try a right click of your mouse on the desktop, choose properties/settings/advanced/adaptor tab and click on "List all modes".
Select 1280x1024 at 60Htz click on OK and click OK again until back to desktop.
leave it like that for a while and see if it cures the problem. If not then go back to the adaptor tab/properties/driver tab and click on "Roll back driver" this will restore your monitor driver to it's prior setting.
There is a display driver download from Microsoft's site that if downloaded along with other updates can cause the display to go off as yours is doing. You may have downloaded this update with others or it may have been done automatically if your system is set for automatic updates.
If both the above fail to cure the problem and it's only started recently then do a system restore to a date prior to this happening.
System restore is done as follows.
Left click on start/all programs/accessories/system tools and scroll down to system restore and click on the Icon.
Follow on-screen instructions, choose a date from before this started to happen. This should cure the problem but again if not then you can undo the system restore by doing the above but instead of selecting a date, select "Undo system restore".
Hope this works for you but if not then it may be due to the graphic card overheating and will require work under warranty. j.