Macbook Pro power button

My boss gave me a 2008 15" Macbook Pro to set up ready for another employee, everything had been wiped off the laptop.
He told me that first he wanted it fixed - the power button only worked occasionally- it always worked for me but I took it to the Genius Bar anyway and they said that it could be to do with the software on it.
I went back got Mavericks installed and everything was fine. Didnt install anything else because of other reasons and 5 days later the power button has decided it will work occasionally again.
It is fully charged as I charged it the previous day, no noise was made at all. After many attempts, i had the disk noise but no start up, another try and it was the chime but no start up. I then had it turned on, turned my back for all of 5 minutes and it shut down again.
Any advice peeps?

Unless you have good electronics experience and are familiar with Mac repairs and authorised by your boss to undertake this work and be responsible for the outcome, then no.

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