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No Video Signal after new PSU and graphics cards

So here is the quick story. I came back after a couple days to find that my desktop that I built was no longer turning on. Turns out the PSU had died. So I got it RMA, and the new one arrived this past Thursday (OCZ ModXStream 600W). I connected it up, and I was unable to get any video output.

I tried with four different graphics cards, in all PCI-e slots on my motherboard (MSI P55 GD65). The fans on the graphics cards would spin, everything seemed to be working, but I could not get any signal to any monitor using any type of output.

I used a PSU tester, and the alarm went off, saying the PG value was high. (link below for manual on my PSU tester and when it makes that alarm). My question is: If the PG value is too high, and that is causing these issues, why does everything else appear to function - case fans, graphics card fans, mobo lights, hard drives, etc.

I tried replacing RAM, even disconnected every single thing (did not touch the proc or heatsink) and then tried to turn it on with just the graphics card connected to the psu (no hard drives or anything). PLEASE any help would be appreciated! I don't want to RMA my board - I did that once, and paid $30 shipping it back (in addition to price paid), and don't want to spend that again when the board is as old as it is (stupid LGA 1156 socket...)

PSU alarm -