Start with a good old pram zap (hold down option, command, p, r all together at startup) Wait until you hear the chime 3 times, then let go. Have you added any 3rd party hardware recently?
PT
I had the very same problem on a G4 533 and an Imac. (a few years apart) I solved both problems the same way. Using the CUDA switch. For an in depth "how to"
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