After having multiple problems with my comp, I think I'm knowledgeable to answer this.
Have you dont any kind of modification to your CPU such as OCing or trying to insert a thermal diode into it? If you've tried THREE different mobos and it still doesn't work, it breaks down to two possiblities. The RAM is not functioning correctly, or the CPU isn't.
If the CPU did not work, the computer shouldn't do anything at all. If the CPU was not functioning, usually the computer will either "blink" if the power is turned on, the fans might move a hair, and the computer lights up for a tenth of a second, and die. OR the computer would just stay on, and nothing would happen. But there is some kind of process running, so I dont believe its the CPU. If the computer restarts when it checks the RAM, then that would be your best bet. I dont know if you just built this system or not, but try another kind of RAM. Make sure you have the correct type. You can try going to newegg and buying a 128 stick of some really cheap a** RAM to see if that is the problem. Just make sure the stick is new.
Is that really the only two messages that come up before it starts? Do you get the logo from the BIOS vendor on the screen as well?
"Just because I'm sitting between you idiots doesn't mean I want to go skiing!"