I recently purchased an Enermax Noisetaker 420 Watt PSU. Installed it, turned on the machine, worked fine. Two days later, I sit down to find that the Computer is off, and the supply appears to be dead. Obviously I need to return the failed unit, but I'm curious to know if this is something I need to expect. Enermax has a pretty good reputation, no? Should I try to switch manufacturers, or did I just get a bum unit?