Hi all. I have problem with my graphic card , Sapphire Radeon HD 7770 Ghz Edition . I try to overclock it a bit in AMD Ccc but I oc a bit to much ,now only what I can see on my tv is "Invalid Format" . I heard windows is starting but nothing on screen apart from that message . I went to safe mode and unistall AMD Ccc ,but that didn't change anything . What else I can do? Thanks in advance for help