Hi, I made a post a couple of days ago about buying a new graphics card. I decided on the BFG GTX 260 896MB. So I went ahead and bought one. So I plug it in and everythings cool, put the system on start up 3dmark06. So it gets to the "deep freeze" part and then my monitor says "no signal" and goes off, my computer then freezes so I reboot and do it again, same thing happens at the same time in 3dmark. So I unplug the card, plug it back in and repeat. This time it gets through 3dmark ok. So I run fallout 3 on max settings, game crashes almost immediately with the same problem as what happened in 3d mark. So I try and unplug the card again and plug it back in, fallout 3 just crashes again. Same as before. Next I check all my temperatures and everything is in the green. My other system components are as follows: Motherboard: Biostar P4M900 RAM: 2GB DDR2 Corsair Value Select Processor: Q6600 @ 2.4Ghz PSU: OCZ StealthXtreme 600W Iam running Windows XP Professional 32bit My system runs fine using a 8800GTS 320MB. (Previous Card) I have had very similar problems in the past with another graphics card on a different machine and it turned out the graphics card was faulty, replacing the card solved the problem. I am just wondering in this case if. A. Do I have a sufficient PSU? B. Anyone else had a similar problem or know how to get around this without having to replace the GPU? Thanks in advance!