Energy settings not kicking in

I've got my energy saver settings so that my monitor shuts off after a few minutes and my computer will sleep if left idle for 2 hours.
Sometimes, however, it doesn't kick in. I won't be running any extra processes, but (for example) I left my computer running when I went to bed while downloading a large file. It never went to sleep.
This happened in Panther (recently upgraded to Tiger) although it doesn't happen all the time. Any ideas?

If you are downloading a large file, it makes sense that your computer won't go to sleep. Check the software you use for downloading to see if it offers an option to download files in the background, in order to allow the monitor to go to sleep.

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