Why does it shut down a few seconds after turning on

I just did the most recent update for my Macbook Pro ( I am posting this message with my older macbook pro), and after the update finished, now when I turn on the unit, the pinwheel spins for about 20 seconds, then the unit shuts off.  I am unable to interrrupt it and get it to open to any screens.

Try to start in Safe Mode: http://support.apple.com/kb/ht1455
See if you can get in that way.

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