Okay, So after two board's I figure out that my PSU you was making them not post bios and was messing something up on them. I had to buy one new board and I had another RMA'd I then RMA'd the PSU unit with was new and it was a coolermaster real true power 750 watt unit. I get my new board and I hook it up to my old psu unit.. everything is working great! I then get the RMA'd psu back and I put it in.. I then hit the start button and BAM give me error 23 then goes to - - (not posting bios) i then hook my old psu back up to my new board that it will not post bios. I think coolermaster sent me the same psu back or is 750watts to much power for a NVIDIA nForce 590 SLI?