My MacBook Pro WILL NOT START. Powers on, grey apple screen loads then shuts off

Fairly new MacBook Pro with OXLion. When I try to turn on the computer, the startup noise and screen appear (grey loading screenwith apple icon). A loading bar at the bottom of the screen fills about a third up, then the computer shuts down again.
ANY HELP?????????

Power off the Mac, press option, command,power button. Just press them at the same time for a second. Then try power up.  If still no joy, try a safe boot. With the Mac powered off, press power button and hold shift key down, this boot will take longer so be patient, continue to hold the shift key till you see the progress bar come up and the spinning gear, you can then release the shift key and let it finish booting. Your login window should come up try logging in.  Check some of the applications and see if they seem to function correctly, in safe boot mode only essential OS applications are launched, if all is normal try powering off and rebooting in the normal mode. If all is well in safe mode itmight mean some third party software could be causing the problems.

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