Mbp won't run (even without battery)

Hi, all.
I noticed a few days ago, my mbp shut down when batt life was at 30%. Battery is on the way out I thought. But now I'm getting worried as mbp will not switch on at all. Even when connected to the power adaptor, battery in or out. The battery indicators say full power. It's a 2008 model, the last before the unibody came out (yup that was gutting!).
According to other threads it should still work with the power supply if the battery is dead. Is this correct? When I push the power button it (mechanically) sounds like it will start, then all is dead after 5 seconds.
Could it be the battery, or does it sound more serious, I have tried the cmd/ctrl power and pram reset
Cheers Matt

Welcome to Apple Discussions!
Did you try a SMC reset?
http://support.apple.com/kb/HT3964
Good luck!

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Mbp won't run (even without battery)

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