Won't wake up, won't turn off

This has been coming on for a long time I think. My beloved Powerbook won't wake up AND it won't turn off using the power button. I'd been getting around the occasional won't-wake-up problem by using the power button. Now I don't know what to do. I've thought of removing the battery for a few minutes, but I'd prefer less drastic measures. Help!

Thanks; that's a reference I need to keep handy. I expect I'll need to do this soon. The won't-turn-off problem was solved this time by the power cord being accidentally unplugged for several hours. Once I plugged it back in & started it up, it was fine (or functional anyway).

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