This is from the TIL:
The following activities may prevent the Macintosh Portable or Powerbook
computer from sleeping unless a low-power condition occurs:
1. The "Stay awake when plugged in" option is selected in the Portable
control panel, AND you are plugged into AC power.
2. The PowerBook or Energy Saver control panel slider selections are set to
"Never sleep."
3. The serial driver is open and active.
4. File sharing is enabled.
5. AppleTalk is active (Check the Chooser).
Note: A volume does not need to be mounted nor do you need to be connected to
an AppleTalk network for this to prevent sleep.
6. An internal modem's auto-answer is on.
7. Some third-party applications keep the CPU busy, not allowing idle
processor time for sleep to occur.
8. If you have any 7.5 Apple Guide help file window is open.
9. The CSW 4000 Series Background extension needs to be disabled. Use the
Extensions Manager control panel to turn off the CSW 4000 Series Background
extension. This will disable background printing but allow the PowerBook to
sleep normally.
10. Your PowerBook will not sleep automatically after the interval of time
set in "System Sleeps" in the PowerBook Control Panel if you are using
version 1.0.3 or earlier of the extension.
> My upgraded one refuses to go to sleep! Unless I choosed sleep from the
> special menu. I can't remember if I did install the latest sleeper after
> running into this problem, but if I did, I think that didn't solve the
> problem either.
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