Hi Kurt

I downloaded the 3Dmark as per suggestion and then ran the "Demo". It played for about 15 sec. and then the computer rebooted. I then tried the "Run 3D MarK" and computer reset immediately. Several attempts all resulted in the computer rebooting....just like when I try to run REFLEX! Is it safe to say that the Radeon card needs replacement?
THANKS AGAIN!

PS Prior to this I had also installed a bios upgrade from Gigabyte for my motherboard, but it made NO difference.