MBP 5,2 wont turn on without power adapter runs fine after started even if unplugged

I have a Mid 2009 MBP 5,2 3.06 c2d 8gb-ddr3-1066 that wont power up without its power adapter however works fine once its started without the power adaptor for the full 4 hours battery life. I can put the computer into sleep (closing the lid) and open it and it works fine. When I push the power button I hear the fans spin up then it dies and if i keep pushing the power button then sometimes ill get to the login screen before it dies but it starts fine with the power adaptor.
I hate to spend $3200 and have it only last 3 years but its so embarrasing to have the computer not work in front of my coworkers.
I tried resetting the SMC and PRAM still unsuccessful in startup.
The computer stated just dieing on me out of nowhere initialy causing much grief and lost data but after resetting the SMC it seemed to have fixed the sudden shutoff issue.
Anyone else have this problem? Perhaps my battery is bad? Logic boards cost as much as a macbook air from what I've heard. Anyone have a 5,2 with this problem as well?

This problem isn't limited to the 5,2 model. My 2007 MacBook 2.16gHz model 2,1 exhibited the same problems that were initially "fixed" by the resets but now is out of commission with a dead logic board. You've done the things you can do, I'd recommend you take it in for service.

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