PC stopped displaying

[Fearthearrow]

I built a computer have a 600w 80+gold psu, amd phenom II x4 965 black 3.4 quad core cpu, 8gb 1333 ram, and a radeon 8670 gpu, the psu has 2 6 pins that I can use and that's what the gpu uses, I also have a radeon 6850 black which uses a 6 pin too but I dont have an extra and i wanted to crossfire them I purchased a 2 4pin molex to 6 pin adapter and installed that with the crossfire adapter and tried turning it on and it wouldn't work the fans would move a millimeter then stop and nothing I tried again and then I gave up on it, i took out the other gpu and unplugged the molex to 6 pin and turned it back on to use it and it worked everything was spinning with the fans and leds came on but the video wouldnt load I tried the other gpu too and nothing tried on a tv and a monitor and couldn't load the screen. Did I break something and if so which component or is there something I could do to try and fix this?