late 2008 mbp won't turn on...HELP!

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i have late 2008 mbp , won't turn on of sudden. have had issue before changed older battery , it's happening again. able use emergency boot method (hold power button 10 secs, plug in charger hold 10 secs, release power button , wait 10 secs, put battery in , push power button). work fan blows loud whole time. know problem? please me..
 



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