Hey guys, Im having screen flickering and artifacting with my HD 5770. Its fairly frequent. It flickers off then back on or looks like a snowflake tv then it turns back on. Sometimes its one screen sometimes the other one. Usually not at the same time. As I type this one is well behaved the other is having issues. I run the HD 5770 and an HD 6870. I recently bought the 5'1 on craigslist. I upgraded the a hex core, ssd and 16gb. With just the HD 5770 in the machine I have no problems on single monitor DVI. I cant run 2x min dp without the screen flickering. Im running 2560 x 1600. So the card doesnt work even by itself. Outside of OS X for example In the bootloader or in the OS Setup I dont have the flickering issue. Its also not a cable issue, ive moved the cables to the 6870 and it seems fine. The 6870 works with no problems. I just need 4x mini dp. Ive tried PRAM and SMC. Neither worked. Im not trying to do anything fancy really just run basic tasks. Is the 5770 bad? Thanks.