Hey so my friend gave me his old Gigabyte Z77 motherboard and I have a XFX Radeon 6950 graphics card and it doesn't want to work on this motherboard. It gives me a black screen. At first it gave me a A6 or Ab code but then when I tried another graphics card (my old nvidia 9500gt) it showed me AE on that but I think that's because of windows because it couldn't load probably because of the hardware changes but I got into the bios. Then when I plugged in the radeon again it gave me the same AE code but still a black screen. If I reset CMOS it goes back to A6/Ab. Also the integrated graphics also work. I got everything plugged in. This radeon gpu works on my old motherboard. So motherboard isn't the problem and neither is the graphics card kinda cuz they both work but don't like each other or something. I have an Antec 550W 80+ Gold I know this gpu needs quite a bit of power but I calculated everything that is essential and plugged in and it should at least go into the bios. Also tried setting PCI to priority in bios and disabling on-board graphics. Also tried booting it from a usb drive with the radeon still nothing. Any suggestions?