MacBook refuses to start day after Yosemite

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hello all, , thank reading problem.



have old 2008 macbook. ran fine, no problems, thing tank. use phd dissertation. last week installed yosemite on it, , starts fine first boot up, work done , go sleep. typical night (other putting new os on). next morning, won't start. @ all.



when power button pressed lights second, optical drive makes bzzzt (typical start noise) fans start second , heard hard disk , shuts down. nothing screen @ all. if hold down button, lasts 4 seconds before front light blinks , computer goes dead again.



i've tried various combinations battery or ac power, used hotkeys (pram reset, assuming on long enough register), , waited several days battery go down bit. nothing, refuses start , have no idea why. nothing has happened it, no drops, no water, no nothing @ between time working fine, , next day not work. charge light , battery both green , no problem there. took out , reinserted memory in case well.



nothing, no effect @ all.



i'm worried. i've read bit nvida problem, not sure if in play here. 1 time in past wouldn't start, seemed weird fluke or battery, , after messing bit, started again. charge issue when hit 0 charge.

smc reset tried, ws smc bypass. still lasts second before off. no response or lights keyboard. front light goes second.


apple store here in japan nightmare make appointment (probably bugs due ios , other problems, ugh). i'm hoping i'm missing possible fix. can't imagine (and cannot remotely afford) fix or let alone new computer well. wonder if yosemite have sort of impact, though software.



please, ideas? i'm desperate here...
 

an 2008 macbook isn't supported yosemite knowledge. how did manage install it?

might try ahold of mountain lion cd , boot / reinstall restore backup. did make backup hope...
 


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