MacBook Pro 15" won't turn on after a shut down.

My MacBook Pro 15" late 2008 mavericks won't turn on after a shut down. Tried SMC reset, plugged and unplugged charger multiple times as well as installing the battery. It has started that after a while I have replaced my old battery with a new one,upgraded to Mavericks and increased my memory to 4GB. In the beginning after I would install every time the battery ,it' would turn on after 8-10 tries. Today it's completely unresponsive . Tested different outlets, with and without battery,nothing worked. I also heard that some other people have this issue once they have updated their operating system from  10.5.8 to Mavericks. Is that the problem.? Has anyone found a solution to this?

Hi there Olgabinou,
You may find the troubleshooting steps in the article below helpful.
Troubleshooting: My computer won't turn on
http://support.apple.com/kb/ts1367
-Griff W. 

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