JUST BUILT MY FIRST NEW COMPUTER, BUT I HAVE A PROBLEM. i CAN TURN IT ON BUT ABOUT 20-30 SECONDS AFTER I TURN IT ON IT SHUTS ITSELF OFF. NOW I HAVE A ASUS A7N8X MOTHERBOARD AND A ATHLON XP 2100. I CAN'T SEEM TO FIND A PROBLEM WITH ANY CONNECTIONS AND AM COMPLETELY LOST. IF ANYONE KNOWS WHAT COULD BE THE PROBLEM, I WOULD REALLY APPRECIATE SOME HELP. ALSO WHEN IT DOES START IT SAYS "WARNING...CPU HAS BEEN CHANGED""

Sounds like a heat problem.

<font color=blue>You're posting in a forum with class. It may be third class, but it's still class!</font color=blue>

Recheck the heat sink mounting and then go through the bios setup to make sure it is right.

<font color=red>The solution may be obvious, but I can't see it for the smoke coming off my processor.</font color=red>