You could also try with one stick of memory in slot one, this would clear and rebuild the DMI table in case that is causing problems.

On memory, did you test the memory in the other PC you were testing the PSU on? Just wondering. Also, did you try starting the board when out of the case and off the motherboard tray, with NO hard drives or CD/DVD drives, ect just the CPU/HSF, memory, and your GFX card?

How about that GFX card, can you also test that in another system to be sure it is functioning?

If you end up having to RMA and need the RMA page let me know.