Monitor doesn't sleep any more

I have a 24" Soyo monitor attached to my Mini....I've had it for at least 6 months now and it's worked fine.
I leave my Mini on 24/7 and have the screensaver set to kick in at 10 minutes and the monitor to sleep at 15 minutes. I don't have the Mini set to sleep because when I did I had a problem with some USB devices not being recognized when it woke up.
As expected, at 10 minutes the screensaver would kick in, and 5 minutes later my monitor would blank out (go to sleep mode - power LED turns from blue to red). However, for the last couple of weeks I notice when I wake up in the morning, the screensaver is still showing on the screen....after 8 hours the monitor still hasn't gone to sleep.
I've restarted...set the sleep time to different values...nothing seems to make the monitor go to sleep any more. Any ideas on getting the expected behavior back?

Try repairing your disk by booting up from the Mc OS X install disk and go to Utilities-->Disk Utility. Select your HD and click repair disk.

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