I am not one to defend ASUS.. In fact usually say "without you they are an ASS" but..
Did you test your mobo on other stuff? Compatibility is not their problem, they post compatibility lists for a reason. (And yes.. big shock not all PSUs will work with all motherboards...you sig lists a server setup... that brings in a whole new slew of issues).
Just saying it is possible unless you were succienct in your RMA issuance that the problem might be genrally specific. (lol)
dont get me wrong, I have had issues with RAM before... got a corsair SSD back recently that I could not install windows on. Despite 3 differnt version of windows on two differnet formats (USB and DVD/CD) and 3 differnet motherboards spanning 2 different architectures. (AMD and Intel)
However when I installed it it shows up in BIOS I can format it, and copy files to it...
On restart it does not show up in BIOS though and that is why i cant install windows
Corsair is known for this issue though. so no shock there.
I checked the manual 10 times, they mentioned that the slot would auto disable if the slot 5 was used, but slot 5 is empty. I tried with all the slots filled and all the slots empty, nothing. If its a design feature then they need to advertise it with 4 x PCI-E ports, not 5, the board is useless to me without all 5 slots. I might as well have gotten the Tyan then.