MacBook does not go to sleep

Hello,

I have a MacBook Pro running 10.4.1. In Energy Saver, my Power Adapter setting is Normal but the laptop does not go to sleep after 10 minutes pass with no activity. Can some one suggest what might be causing this? The laptop goes to sleep properly when I am running off the battery.

Thanks.

Upgrade to 10.4.10 first. Do you have 'wake on ethernet' set?

Sorry, I am using 10.4.10. Left out the last 0. I do have 'wake on ethernet' set because that is part of the Normal setting. Do you recommend de-selecting this?

I am having the same problem on my MacBook. Sleeps fine with the lid closed, but if I leave the lid open, the screen goes black (like it should) but no sleep -- at least the light does not pulse -- just stays bright. Wake on ethernet not selected. Any other ideas?

Thanks in advance!