In addition to the not waking from sleep, today after trying about 5 times to wake my powerbook (by holding down the power button), my powerbook beeped (!!? yes it did) and the sleep LED flashed/pulsed several times very fast.
What error does that mean? I've never read or heard about it.
The concerning thing is that normally when it won't wake up, I hold down the power button and it shuts off, I press the power button (and there is some kind of movement inside, optical drive?) that lets me know the machine is turning on, and it turns on. This time it took 7+ times for the powerbook to actually boot up. 2 additional tries after it beeped and LED flashed.