Won't sleep after install of wireless router

I bought a D-link WBR-2310 wireless router and installed it between the internet modem and my iMac. Everything is working good after configuring the router but my iMac won't sleep now. Its like the iMac is picking up a constant signal from the D-link via the ethernet port. Any thoughts?
Thanks

To Apple Discussions!
First check the sleep settings in Energy Saver preferences. If everything looks correct and..........
If you are using a cable modem turn your computer & the cable modem off. After about 30 seconds - 1 minute, turn the modem back on first, then turn your computer on.
Please post back your results.

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

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com.apple.PowerManagement.plist
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== This happened ==
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Ok. Nevermind. I guess I had to Force Quit/Relaunch Finder.

Won't sleep after install of wireless router

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