XPS 600 won't boot. Ordered new power supply from Dell. Still no boot. Ordered new motherboard, I/O board and it worked for about a day... now it's back to front panel diag light number 4 on solid... And yes... light number 4 is the only one not mentioned on edocs...

 

As soon as I plug in the power it revs up high but nothing else. I can hold the power button and kill it but thats it.

 

I've tried removing memory, I do't even have any drives hooked up...

 

Any suggestions?