G4 won't wake after sleeping

My ibook G4 has recently been unable to wake after sleeping. The only recent software change was a Security update and itunes update. the problem seemed to start just after that.
Any ideas?
Thanks,
Chuck

The screen is not set to dark. When it fails to wake up from sleeping, there is no noise from the disk drive. There is no reaction to any input except holding the on off button until it restarts.
This seems to be an intermittent problem; sometimes it won't wake at all, sometimes it wakes, but makes a steady buzzing noise until I restart it.
I've set it to never sleep, but since I travel with my computer most every day, I do have to close it, and then often have the problem when I re-open it.

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