Hi, all of a sudden my desktop computer screen goes blank...then after 15 or so seconds the screen comes back..and my open applications are in a frozen state...then it goes blank again..also the Monitor light is still on, so i dont know what the problem could be.....this keeps on repeating until i do a hard shutdown....Any help would be appreciated...Thanks!

Sounds like a hardware issue related to your video card or you are overheating. but start with making sure your system is clean and maintained. run chkdsk /r update and run your antivirus/malware/spyware checkers run disk cleanup run defragmenter

I had a similar problem about a month back. The monitor would go black randomly but would come right on a restart. It appeared to be a heat-related problem. Here is what fixed my problem: Removed and cleaned video adapter card and fan with soft bristle paint brush and vacuum. Re-installed card making sure it clicked firmly into place. Removed cpu fan and gave it same treatment. While it was removed I gave the cpu heat sink a good brush and vacuuming, making sure ALL dust had been removed. You should be able to do this without removing the heat sink. While I was on the job I removed, cleaned and re-installed the power supply fan assembly. I have had no problems with black screen since Good luck.

Don't use a vacuum or brush. Static electricity would make your card good only for a paperweight. Best to use a can of compressed air.