Video Card??

[saturn]

My son tells me that his monitor goes black after using his computer for about 30 mins or so.Is there a way I can run a test on his video card?I'm thinking that what's going on.I guess when I sees him today i'll make sure all his fans are working properly.

[Raymond]

Have you checked the Power Options?
Go to Control Panel > Power Options.
Maybe it is set to turn off the monitor after 30 minutes.

[saturn]

He tells me that it freezes for about 15 seconds before this happens.The worst thing about it is he had a technician rebuild this tower with new parts about 2 years ago.

[Rush]

Try gpu-z
http://www.techpowerup.com/gpuz/
It has a lot of useful information about the card. At least give you a way to watch it.