Dock ceases to work as it did before

My dock has suddenly ceased to work as it did before.
It used to appear on moving the mouse to the bottom of the screen, and the icons would magnify as the mouse was passed over them. Now this does not happen (though the dock can be obtained in other ways).
After reading up on problems people had had with the dock, I went to library/preferences and deleted the files beginning com.apple.dock, then restarted.
This has not brought the dock back to how it was. It still does not appear on mousing over and does not magnify in the correct way. Yes, I have re-set the dock preferences.
It's an iMac ruuing 10.8.2.

I've fixed it now. The solution was to unplug the mouse transmitter and plug it in again. Very strange.

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Totally Confuzed

Re: After trying to install 6500 Wireless all-in-one on my 3rd comp, it ceased to work
Ref: 02-23-2012 08:53 AM
12:38 AM 2/24/2012 UPDATE ON WHAT I HAVE TRIED AGAIN:
1. Power Reset on the Printer: Power off the printer. Unplug the power cable from the back of the unit. Wait 60 seconds. Replug the power cable to the printer and power it on. DONE
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If that does not work, then I would see this FAQ Entry: http://forums.adobe.com/thread/792580?tstart=0
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Dock ceases to work as it did before

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