After several power outages, there is only a white screen, an apple in the center and a time strip after the strip is complete it turns it self off what is this problem

I have a 27in Mac desk top, its about a 2009, after several power outages and the computer pluged up and on now when turn it on it shows a white screen, apple in the center and a time strip toward the bottom when the time strip goes to the end of the cycle it shuts its self off.
The only thing we have tryed which was from a forum which was simular problem was, command-option-p-r, hold them down til the screen was back up, we try several times it did not work, please,please some-one help we use this computer for our job.

Also the trick you used, is known as resetting the PRAM. Not always the best of ideas for Macs older than 4 years.  But I'm glad it worked for you.  There is a battery which will eventually need replacing inside that would actually make that technique stop your Mac from working until replaced.

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