boot up issue / crash HELP

Sep 10, 2014
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Macbook Pro 17 inch mid 2009
Processor 2.8 GHz Intel Core 2 Duo
Memory 8 GB 1067 MHz DDR3
Graphics NVIDIA GeForce 9400M 256 MB
erial Number W800301L8YA
Software OS X 10.9.4 (13E28)

Ok...those are the specs and here is the problem. In 2011 i had a new logic board put in along with a new display. Since that time I have only used the machine for about 200 hours. Now whenever i boot from sleep or power on the machine crashes before the little wheel below the apple begins to spin. I will press the power button many times and it will start will hear the music but before it gets to the wheel crashes. After a number of times of pressing the power button ( i have to hold the power button down till the white lite in the front of the machine flashes ...then I let it go...just pressing it quickly NEVER works). After numerous attempts...FINALLY the little wheel will begin to spin and the machine starts up and works as it should never crashes when it has finally turned on. Would love to have some input as to what the issue might be. Thanks Threewise

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