My mac book will not start at all

Suddenly my mac book pro will not turn off.  first it started with the computer cutting off rather than going to sleeep then it started cutting off while I was using it.  I became worried that there was a problem and went to back up the hard drive on an external hard drive but suddenly the computer would not start at all.  before that happened i would get the gray screen with the dial and a bar underneath.  Help!

See if these support articles help:
http://support.apple.com/kb/TS1587
http://support.apple.com/kb/TS1367
Ciao.

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