MacBook switches off randomly even when connected to mains without battery

Hey, i've had a MacBook for nearly 16 months now and it's always worked ok but recently every time i switch it on, about 1-5 minutes later it will just die and switch off! If i try to switch it on after this it just keeps dying. The only way to get it on and working again, is to hold down the power button until the sleep light flickers and i here a short continuous beep. After this it works fine although the fan runs for the most time on use. I thought this might be a battery problem but i've removed the battery and just run the macbook from the mains and it still switches off in this first period. If anyone knows the source of the problem or could point me in the direction of a relevant post that could help, it would be much appreciated.
Thanks, Ashley.

I suggest you upgrade your software. Tiger is at 10.4.11 now and a lot of stuff has been fixed since 10.4.06
Reset the SMC (System Management Controller) and/or PRAM (Parameter Random Access Memory). Mac OS X: What's stored in PRAM?

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ThinkPads: S30, T43, X60t, X1, W700ds, IdeaPad Y710, IdeaCentre: A300, IdeaPad K1
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MacBook switches off randomly even when connected to mains without battery

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