I have a Dell Studio XPS withIntel i-7 860, Nvidia PNY gtx470 GPU, and Thermaltake 600w PSU. The system is almost 3yrs old and has been awesome but last night it crashed and rebooted a couple times but I was using the new driver 320.18 and I seen where others had similar issues so reinstalled 314.21 no go still having flickering and crashes. I can't get it to boot without horrible resolution and my GPU widget states that no GPU found. But in event viewer it says power has cut out unexpectedly and also GPU driver has crashed. Before the issue really got bad I noticed pixels flickering and blocking. Anyway what do you think is the issue GPU or PSU but I am pretty sure its the GPU cause I have gamed hard on it for awhile sometimes 90c temps during certain games. Any ideas or suggestions on a way to find out for certain what's causing the issue? I hope it is the PSU but I doubt it they're not $300+ like the gpu! Thanks for any help!