Thanee said:Does your mainboard have onboard graphics?
Then just take the gfx card out hook the monitor up with the onboard gfx and try to boot just so.
ssampier said:I'm thinking a RAM issue. I would test it with Memtest86.
http://www.memtest86.com/.
As mentioned, it could be heat. I use SpeedFan to monitor my system temps.
http://www.almico.com/speedfan.php
ssampier said:Borrow a buddies graphic card (old and slow doesn't matter) and see if you get anything. If not, I'm thinking power supply or motherboard. Do you hear any fans whirring?