I'm trying to clear my slate of computer work so I can get in the field.  But I have this e-machine that is exasperating.

It starts and gives me the black screen with the usual information. It gives me an option to "fix" the machine and then if I choose that it shuts off.  Same thing if I try to boot normally OR try to boot into safe mode.

Booting from a Linux CD gets me so far and then it shuts off.

I've run the mem test program and no errors showed up.  Note it ran for quite a while and completed.

I unplugged the hard drive and tried booting from the CD.  It goes so far and shuts down.

I pulled the memory out one at a time and tried to boot.  No luck.

I can't believe it's the power supply or it wouldn't run the test for mem.  Then too I an leave it set for as long as I want on the black screen asking if I want to boot into safe mode.  Or using the Linux CD I can leave it set too.

I'm starting to think it's the motherboard.

Thoughts?