Mac Mini won't go to sleep anymore

Had my Mac mini for a while now..and its never had a problem automatically going to sleep (after 15 mins). Within the last few weeks it never sleeps on its own. I can manually cause it to sleep, which works fine.
Recent things done to this mac include:
- installed magic mouse + driver update requested by Apple
- normal OS updates (now at Snow L version 10.6.2)
What I have tried:
- restart computer
- ensure nothing is running in background
Checked my syslog and found the following lines which were repeated at regular intervals that seem to occur when it was trying to go to sleep.
Thu Nov 26 19:27:11 my-mac-mini-2 StatusMenu[148] <Warning>: receiveSleepNote: NSWorkspaceWillSleepNotification
Thu Nov 26 19:27:13 my-mac-mini-2 StatusMenu[148] <Warning>: receiveSleepNote: NSWorkspaceDidWakeNotification
Thu Nov 26 19:27:13 my-mac-mini-2 configd[13] <Notice>: network configuration changed.
Thu Nov 26 19:27:13 my-mac-mini-2 vmnet-bridge[90] <Notice>: Examining network configuration.
Thu Nov 26 19:27:13 my-mac-mini-2 vmnet-bridge[90] <Notice>: Turning off bridge for: en0
Thu Nov 26 19:27:14 my-mac-mini-2 configd[13] <Notice>: network configuration changed.
Thu Nov 26 19:27:14 my-mac-mini-2 vmnet-bridge[90] <Notice>: Examining network configuration.
Thu Nov 26 19:27:14 my-mac-mini-2 vmnet-bridge[90] <Notice>: Intf: en0
Thu Nov 26 19:27:14 my-mac-mini-2 vmnet-bridge[90] <Notice>: Turning on bridge for: en0
Thu Nov 26 19:29:11 my-mac-mini-2 StatusMenu[148] <Warning>: receiveSleepNote: NSWorkspaceWillSleepNotification
Thu Nov 26 19:29:13 my-mac-mini-2 StatusMenu[148] <Warning>: receiveSleepNote: NSWorkspaceDidWakeNotification
Thu Nov 26 19:29:13 my-mac-mini-2 vmnet-bridge[90] <Notice>: Examining network configuration.
Thu Nov 26 19:29:13 my-mac-mini-2 configd[13] <Notice>: network configuration changed.
Thu Nov 26 19:29:13 my-mac-mini-2 vmnet-bridge[90] <Notice>: Turning off bridge for: en0
Thu Nov 26 19:29:14 my-mac-mini-2 configd[13] <Notice>: network configuration changed.
Thu Nov 26 19:29:14 my-mac-mini-2 vmnet-bridge[90] <Notice>: Examining network configuration.
Thu Nov 26 19:29:14 my-mac-mini-2 vmnet-bridge[90] <Notice>: Intf: en0
Thu Nov 26 19:29:14 my-mac-mini-2 vmnet-bridge[90] <Notice>: Turning on bridge for: en0
Any ideas?

Several mention having solved your sleep problem by [using terminal and this command|http://discussions.apple.com/thread.jspa?threadID=2078738]:
sudo launchctl unload -w /System/Library/LaunchDaemons/org.cups.cupsd.plist
For a description of this command, other related commands, and it's function, see the thread I linked. Note that the posts on the linked thread are not the ones mentioning having fixed the sleep problem using the command.
Also, [PleaseSleep|http://www.dragonone.com/products/macosx/pleasesleep> have worked for some when other means of solving their problems could not be found.

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