Macbook turns on to gray startup screen but will not load and shuts down after about 45sec -1 min

Hi There,
My Macbook pro has been experiencing some craziness the last couple of days.
Yesterday it was sort of slow and I was experiencing the rainbow spinning wheel between all applications.
The battery was very low so I charged it and attempted to turn it on today.
Now, when I turn it on I am experiencing the gray startup screen with the spinning geat and what sounds like
the CD drive going ( I believe I have a disk in there). After less than 45 sec to 1 minute the machine just shuts off.
I have tried the safety start and a few other startup methods, but always the same result.
Any ideas or should I go strait to Apple hospital?
Thanks-

Did you find any help to this? I have the same problem!

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Macbook turns on to gray startup screen but will not load and shuts down after about 45sec -1 min

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