The coolermaster in 850w shows different LED's compared to the 520w's, The 520w don't go green and only goes red if there is a fault, I checked the power connections once again praying I could get my rig up and running last night but no hope.
When the power button is hit the red light on the back of the psu flicks on then stays red (so the P/B works), PSU fan don't even spin. All I can think is that the mobo connections are screwed or its the PSU, Just ordered a new PSU so I hope its not the mobo. I'm sending it back today and went for a OCZ 600w PSU cost roughly the same as the coolermaster 520w decided I didn't need the SLI as I'm more of a ATI guy.
Pray for me guys, should be up and running saturday morning if everything runs smoothly.