Imac 24 won't sleep after installing Airport Extreme

Hi there.
This topic may have been covered already, but does anyone know why I can't seem to get either my Imac 24 display or the internal HD to automatically sleep after installing the Airport Extreme .11n?
Both the display and internal HD would sleep just fine when directly connected to modem, but now with Airport Extreme, only the screen saver appears and I can't get either the display or drive to sleep.
Thanks
Imac 24   Mac OS X (10.4.9)  

Hmm, check your settings for sleeping.
Try Apple Web Chat
http://www.apple.com/support/chat

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