Video software cause Mac Pro to lose power

My Mac Pro has begun doing something very strange. On Mac OSX Snow Leopord or Lion, when using video conversion software (HandBrake or MacX Video Covnerter) My Mac Pro acts like it los power from the outlet as my UPS connected via USB starts alarming. If I let the software continue to run my Mac shuts down. It never did this before and I recently did a clean install of both OS versions and the software.I have tried disconneting the UPS and my Mac stills shuts down. I have also reinstalled the two video conversion softwares with the latest version and get the same results.
I could use some serious help here.

...and the overheading may be caused by dust.  So when was the last time you blew the dust out?
Also, would go get the same overloading problem if you bypassed the UPS?

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