IMac HDMI 'Mirroring' problems with LG 'Full HD' TV

I have my 20” aluminium iMac connected via a mini-DVI/HDMI adapter to my LG 32LF7700 full HD LCD TV. In mirroring mode it’s pretty good, but I have two problems.
1. Even when I turn ‘Mirroring’ off from my Mac’s displays ‘Menu’ options I still have the ‘Snow Leopard’ desktop background on my TV, and my iMac’s mouse will not stay within the iMac screen area. The mouse can still move off the iMac screen into the TV area. Is there any way, apart from unplugging the TV HDMI cable, to revert fully to the iMac screen when I turn ‘Mirroring’ off?
2. When playing movies in 16x9 ‘full screen’ on the iMac the image is not quite full screen on my TV. I had a ‘HD ready’ TV before the LG one and it was possible to fill the screen. Am I missing something in the settings that would make 16’x9 full screen’ on the iMac give me ‘full screen’ on my TV. My TV is PAL, 1080p (or 1080i), and is properly detected by the iMac.
Thanks.

Perhaps you misunderstand the two display process with a Mac. There are only two modes;
Mirroring is when both screens display the same thing, so your HDTV is just perhaps providing a larger version of the iMac display for using from across the room. The other is Extended Desktop mode, which creates a wide Mac Desktop that extends from one display to the other, based on which order that you have arranged the two display icons in Sys Prefs/Displays. This is why your mouse will travel from one display to the other as it travels across this wide Desktop.
In addition to the order that you have arranged these Desktops, you can choose which one is primary by dragging the Menubar from one icon to the other in Sys Prefs/Displays.
As far as watching videos, I d not have two monitors upon which to test this, but I believe that you can adjust the two displays screen resolutions separately in Sys Prefs/Displays.
If you go to the Help menu in the Finder choose Mac Help. After it opens click the index in the upper right and go to D/Displays. You will find some explanations about using multiple displays with your iMac, including Extended and Mirrored modes.
Dah•veed

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