Starts and then turns off!

Ok so my Macbook will start up I see the apple and then it turns off before it loads, I've tried resetting the PRAM the SMC and the ctrlapplepowerbutton and noen of i works, I hold down Option and I can choose to boot from CD or windows but if i click that it shuts down. The only way the computer stays on is in Target Mode. Anyone know what I can do. My warranty is up and i can't afford to have them just look at it just yet.
Thanks

I know my Mac is old, but it works just fine. It's just that even though the battery is full, and all the indicators tell me it is, if the power cord happens to fall off (it's the magnetic one), the whole Mac dies suddenly, doesn't save anything that's open at the time and requires a hard boot to get going again, and only if the cord is plugged. I'm assuming my battery is old anyway, as before this started, it hadn't held the charge for more than an hour. Am I better off replacing the entire machine or replacing the battery and cord and hope that works?

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