Help! My MacPro goes into high speed loud FAN mode and Races..

So My MAC PRO Intel/  dual hard drive tower computer..will be 7 years old this March, last night it went into LOUD FAN mode..racing..and pretty loud...like air was blowing through the whole thing; I've seen someone else's computer do this; WHAT is this!??  I couldn't shut down by pressing ESC/      I had to HOLD the power button five seconds for it to shut down.  WHY does it do this?   Im on Snow Leapord I think 10.4.11
It was a scary thing... What is this?? thx in advance, Larry NYC

basically this is a hardware problem causing a kernal panic.  It could be any number of things.
A good place to start is to boot from your system recovery disk and run some hardware diagnostics.
http://support.apple.com/kb/ht1509
I had this happen years ago with a G5 and finaly traced it to problems in the motherboard.  Total loss.
Oh, and BTW Snow Leopard is 10.6.  10.4 is Tiger.

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