My power mac g4 won't switch on power switch just keeps flashing?

My G4 has suddenly stopped powering up. The power button just keeps flashing slowly, but the monitor shows nothing, any suggestions?

Was there any beeping at power on?  Is the flashing a sequence of short flashes at half-second intervals, with the sequence repeated at five-second intervals?  That may indicate a memory or logic board problem.
Also, have you reset the CUDA chip?
FInally, how old is your PRAM battery?  That may be causing problems as well, though usually PRAM related problems show up later in the boot process.

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