Resolution Problems After Mac Mini Wakes Up

I have a 1.66MHz Core Duo Mac Mini hooked up to a Westinghouse LTV-27w6HD LCD TV. The screen is set to 1366 X 768 resolution and looks fine when the mini first boots up. Once the Mini goes to sleep however things go wrong. When it wakes up the screen is off center with the right side of the screen messed up. Any help?

Just a minor correction to an otherwise good set of suggestions:
Since this is an Intel mini, the PMU reset isn't the right procedure (Intel mini's don't have a PMU). For Intel systems, it's an SMC reset, which is almost the same procedure, but not quite.
To reset the SMC:
-From the Apple menu, choose Shut Down (or if the computer is not responding, hold the power button until it turns off).
-Unplug all cables from the computer, including the power cord and any display cables.
-Wait at least 15 seconds.
-Plug the power cord back in, making sure the power button is not being pressed at the time.
-Then reconnect your keyboard and mouse to the computer.
-Press the power button on the back to start up your computer.

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Hi,
sorry for the delay, but I was on a business trip.
@Bsteely: Sometimes it wakes up immediately because of loosing connection to the keaboard when I send it to sleep. I suppose at the beginning of the sleep mode it into sleep mode, the keaboard connection is closed, then the keyboard "thinks" there is a problem and sends a message to the mini and the mini just wakes up again showing that the connection to the keyboard was lost but established again! This even happened as I had unselected the checkbox "Allow Bluetooth devices to wake up this computer" in Preferences -> Bluetooth -> Advanced.
But there are also times when the mini does not wake up so quickly. It just wakes up after hours. I had a look at Console.app as you suggested. Very weird to me indeed Well there I found something like "Wake reason = OHC2" or "Wake reason = OHC1". Unfortunately I cannot find older logs there.
@Boece: Hi and thanks for helping!
Well, I will try the update as soon as I can. By now I have no external harddisk to first save my data before doing the big update. But I am going to buy one soon.
Well turning off the monitor is OK, but the harddisk can wake up anytime while the mini is turned on as the OS might need to do something from time to time. And I don't want my computer to consume electricity even if it is such a small one like the mini. I'm a kind of green dude (but not from Mars ). And the sleep mode is interesting for me as I have very often many different Internet sites and some applications running, so I don't need to close them before turning off and open all of them again when turning on the mini.
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Thanks again for your support guys. Please let me know if you have any further information of ideas.
Cheers
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Klaus1's great post on MacKeeper...
https://discussions.apple.com/docs/DOC-3027#comment-2156
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https://discussions.apple.com/message/15732233#15732233
https://discussions.apple.com/thread/2779849?start=0&tstart=0
http://applehelpwriter.com/2011/09/21/how-to-uninstall-mackeeper-malware/
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Welcome to the Apple Support Communities!
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Resolution Problems After Mac Mini Wakes Up

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