How to fix "screen keeps going black"

1) can be because of over buildup of cache and corrupted windows 7 resource files

Try to clean following folder:

% temp%
preferch

And Run the commands in cmd

chkdsk
sfc/scannow

2) malware may be altering settings -> scan with malwarebyte, MS malware removal tool.

3) detective / old graphical drivers

Try to update drivers from your PC vendor website.

4) boot up file sequence may get modified / defective settings. Try windows startup repair

http://www.howtogeek.com/howto/7728/troubleshot-startup-problems-with-startup-repair-tool-in-windows-7-vista/

5) lose connection: Check your cable between your computer an monitor

6) problem with monitor itself. Try to get it repaired.

Read more: http://www.euask.com/topic/6327-Screen-keeps-going-black