iBook shuts down instead of sleeping

[croberts134]

Two days ago my iBook G4 (about 18 months old) has started to shut down instead of sleeping when I close it or when I select "Sleep" from the menu.

Strangely enough, it seems to only happen when I have iTunes open before I try to put the computer to sleep.

Any ideas why this is happening?

 

[mad jew]

Not really sure why it's happening, but see how a PMU reset goes for you.