Hello there guys. My system has been a bit unstable during the last month. A week ago it started giving me one-color screen freezes, or full screen vertical lines and freezes. I removed my Sapphire 7970 OC with Boost GPU (blue PCB), cleaned it, reseated the cooler, blew into the PCI-express slot and it seemed to have come back to normal. Yesterday it did the same, only the treatment didn't really work this time. This is the kind of image I get (badly taken image from the BIOS): Spoiler I barely managed to boot it in DOS mode with a USB stick and used ATIflash to flash back the original vBIOS, but it didn't seem to matter. I'm still getting exactly the same artifacts. The card doesn't seem to have a physical defect as far as I can see with all of the cooling/retention brackets removed. While in DOS mode I had two big vertical stripes from top to bottom of the screen, and it was full of weird characters like É in pink color, all over the screen at random locations. When the system boots Windows the screen simply turns black. My motherboard has four PCI-e x16 slots, so I tried the card in all of them. It did the same in every single one (along with the cleaning/applying paste/reseating that I mentioned above). Unfortunately the card had only a two year warranty, so... : S My guess is that it's hopeless, but it had managed to work since last time, so I'm willing to give it another shot if you have any ideas. Thanks!