MacBook Pro Won't Turn On!

Okay you need to get into the box your mac came in and get little black folder and get the everything else folder from it ,grab the Mac OSX install CD its a grey disc in a clear plastic case. Put that in your Cd drive in the side of your computer,
Note your HDD may have crashed, is it older or newer? when did this take place? Where you installing a software update prior to this happening? Is this happening to you from a new computer out of the box? What year is your computer
These are details we need to better dial in on a solution, but this is my estimate on a fix based on the details given,
Note wwhen you hit the power button have the Install Cd in the Port ready to go.(Close)

Anything weird happen before this started? Short out, or Memory failure, restarting, for a software update. What type of HDD do you have?

That tells me a lot actually, the mouse spinning and a blatant freeze, then a restart. That is exactly what i meant you probably need to give apple a ring, its probably your Hard Drive and is still probably covered under warranty, sorry for your luck. They can probably help you better than I can.