Early 2008 MacBook pro immediately shuts down after start up

Today, After shutting down my computer by holding down the power button (which I do quite often) my mbp shuts down immediately (about 1 second after) pressing the power button. After I press the power button the computer starts up i.e the fans start etc, but about 1 second later it shuts down again. I have tried resetting the SMC to no avail... Any help would be greatly apreciated. My os is leopard
Message was edited by: Masons777

Welcome to Apple Support Communities
Is this happening on MagSafe/mains power or Battery ?
If battery then it sounds like it's died, check System Profiler / Power to see what's showing for it.

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