Mac SUDDENLY reboots continuously and displays apple logo that is half blue and half gray

I was surfing the web and my Mac goes black and reboots unexpectedly. I say OK, fine.....gray screen comes up then a Apple Logo that is half Blue and half gray appears with a graduated progress bar under the logo......it progresses half way then reboots and repeats-over and over again... I turned the unit off completely to cool off and give it a break.
I disconnected the ethernet cable and a few preipherals.
I am about to re-start in safe mode but wanted to bounce this here first.

Well I took it to the GENIUS BAR and they have to replace the logic board which wont be in until Friday which *****....I am so glad i have APPLE CARE. is all I can say...I am also so very happy this isn't a WINDOWS BOX situation because then there wouldn't be TIME MACHINE. I may or may not have to restore from backup but it is there is I need it....so I will have to re-install all 3rd party software....but hopefully all the data will be there somewhere.....
thanks for everyone's help during moments of panic...
v

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