I have a Geforce 9600 GSO working with a Intel DP45G (or something like that) and a 730W power supply. When I switch to a Radeon HD 6990 I have no video.
- The GPU fan is spinning
- The boot produces only the expected beep
- The power supply is 20W weaker than required
- The power supply has 2 x6-pin connectors instead of the required 8-pin connectors, but the card came with adapters.
- The card has a 1-2 switch, which I guess is for the crossfire, I tested in both modes.
What seems to be the cause of the problem? A malfunctioning card?