Well, the label for the PSU says 2 12v rails at 30a apiece. It should have been more than enough, but I'm with you on doubts that it's very efficient. Possible the fan went out, and that took it out due to heat. I think they should honor your warranty. If they put a crap PSU in their machines, and then like most people, you want to upgrade it, and the PSU specs look ok to the average joe, (as in "This card needs xxx watt PSU") then this is gonna happen. I told my friend who was considering a cyberpower PC to have them put in a name brand PSU, I have heard they always use garbage PSUs.