They will try to blame the mobo for taking out the psu, or too much power requirement for the psu or just try to blag you to death. Be prepared for some complete BS from them. I had to hang up on them before i said something i regretted. Told them to stick their RMA where the sun does'nt shine (not the actual words i used) first though. I then went outside with the Hiper and a 14lb sledgehammer and beat it to a pulp, much to my 70 yr old neighbours horror. Made me feel a bit better, until i paid for the new bits that was.
Have you seen how many Hipers are for sale on the bay? Most of them are RMA replacements in the descriptions.