I had a buddy call just last night with similar problem. We found that by disconnecting a DVD drive he was able to boot up. Something must have been happening when the OS checked that drive, because it would shutdown during boot ... and once in a while when he did get booted up all the way, it would shut down as soon as he put a disk in either of the two drives using that IDE cable
Disconnecting one at a time revealed the culprit drive.


Make your sound your own!
.. I do not work here, but the benefits are still awesome