Hello, I bought a XFX Radeon HD 6850 with 2 6-pin power connection outputs. My 500W PSU does not have those connectors, so, I hope I can purchase some adapter of sorts. When I attached my card to my PCI Express x16 2.0 slot, it was not detected when I used the onboard video signal, nor did the picture appear even though POST went successfully. I can't even install the XFX drivers. What is going on? I hope I can purchase the auxilary adapter at Best Buy. Do nearby retail chains sell a 4-pin PSU connector to 2 x 6-pin SLI/Crossfire connectors, which may be unlikely?