yesterday i've updates the driver for my GPU to the latest version (crimson, I believe) and rebooted the PC.
now when the PC boots, it beeps twice and repeats it once, which according to my motherboards manufacturer means that "Video error (no add-in graphics card installed)", and then it continues to boot normally (i can hear windows loading) but there is no video output...i can't even see the BIOS screen, nothing.
i've tried resetting my GPU, the RAMs, tried disconnecting the GPU completely and the HDDs completely, tried resetting the BIOS (with the jumper).
CPU: Intel i5 2550k
CPU cooling: Arctic Cooling Freezer 13
Motherboard: Intel Z77SL-50K
Memory: 16 GB (2x8) G. Skill RipjawsX DDR3 1600MHz
GPU: Sapphire Radeon HD 7870 GHz Edition 2GB
PSU: Cougar RS550
OS: Windows 7 64-bit
i've replaced the HD7870 with and old Geforce 8800GT and it booted and worked fine, so i reseted the BIOS once again, deleted all of the AMD software and drivers with the AMD cleaning tool.
i returned the HD7870 to the PC and now while booting the beeps are gone, but the HD7870 is still not recognized in the BIOS and still no video output.
tried putting the HD7870 on a different computer, installed the previous drivers (not the crimson) and it works just fine.
again, I tried putting the HD7870 back in my PC but that still doesnt work..