My system finally shut down for good--I also a smelled of something burning. I felt the 500 PSU was probably struggling considering it is a SLI setup. So, I got a new 750 PSU and got a new motherboard. I put the system together, but the same problem happened--the fan would turn on for a second, then shut off. I decided not to try to turn it on of fear of wrecking another PSU.
So, whats the problem. Is it the case switch causing problem? Maybe its the HD, SLI, floppy? Any suggestions? I'm leaning towards case problem. Should I go ahead and get a case?