Started mining in June, this is my rig, 2x HD 5850 and 1x HD 6850, planning to replace 6850 with a 58xx and add 1-2 more GPUs (some 58xx) by next month. Had to replace Corsair VX 550 because it broke after approx. 336h of continuous load of ~600W (all GPUs and Q9300 overclocked and overvolted). TX850 is fine now 
From your pic, the PSU 12V pin on the ATX connectors are burnt. If you still have the PSU, it is still usable. Just replace the pins and the ATX connector and you are good to go.
You can refer to the following:
https://bitcointalk.org/index.php?topic=53904.0