Upon first boot the screen was covered in graphical artifacts (jagged lines, missing letters, numbers instead of letters etc.) which persisted through to the OS (Win 7) I installed.
I swapped graphics cards with my other desktop (HD6850, 750 watts, same OS etc.), and both cards worked perfectly, so it is something specific to the HD7950 and this computer build. Could it be 500 watts is not enough to power it? Tried connecting only base essentials i.e. motherboard, HDD, fans, and graphics
card; still massive artifacts, and resolutions higher than 800x600 result in blank screen.
I have swapped monitors; no difference. I Have installed latest Catalyst drivers, c++, direct x etc. which are irrelevant anyway seeing as the issue carries over to POST, BIOS, and boot screens.
Any help would be much appreciated!