xps 630i won't post

This morning I was using my 2 month old xps630i as usual - and it locked up. I was listening to an internet radio station at the time and the audio locked into a loop - all other programs froze - could not use the mouse. CTRL-ALT-DEL did nothing. System was completely locked up.

Did a hard boot - would not post, single error tone screeching.

Unplugged it, waited 30 minutes, reseated the RAM and tried booting it again - when I plugged in the power cord it suddenly turned on like it was going to boot, same single error tone. Let me reiterate, I did not touch the power button on the front - the machine tried to boot as soon as I plugged in the power cord.

Waited 60 minutes - plugged in power cord - same behaviour: system attempted to boot, same single continuous error tone.

I would like a link to the list of error tones for the 630i.

And any other ideas you may have about what happened to my system.

It is under warrenty.