PowerPC :: IBook G3 Frozen In Sleep?

Last night I put my iBook to sleep and now it won't seem to wake up. The little snoring light thing is maybe half-lit, but it doesn't snore like normal--just one solid, half-way lit light. I've tried force shuttng down (holding down the power button) and force restarting (command-control-power), and neither work. I've also tried the obvious--closing lid (it was open), unplugging it (the battery still has life though).

Anything else I can do?