Display Mirroring Problem

I am running OSX 10.6.8 on a 27" iMac. I have my HDTV connected via the Mini DisplayPort. The only way I have been able to use my TV as a monitor (e.g., to play a movie on the iMac and watch it on the TV) is to mirror the displays.
The problem with this is that I can't use my iMac whenever I am doing this.
Is there a way to play a movie on the mac and output it to the TV while I am using the computer for something else?
Thanks,
M.

Strange indeed.
Do you have to use an adaptor on the PowerBook's video-out port to connect the TV? Sometimes an adaptor by itself left on the computer can affect internal settings.
It was an old trick with the venerable PowerMac Beige G3 series to force certain monitors to work from a PCI video card. We'd attach a Mac-to-VGA adaptor to the logic board video-out port, but connect nothing to it, to trick the computer to "think" there was a real monitor attached there.
So...if you have been leaving a video adaptor connected to the computer, see if things change when you remove it.
Guessing here: Are you hot-connecting the TV? I don't know if that's good or bad on the newer Macs but, in the "dino-days" we were taught to attach extra monitors only when the computer was off.

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<Image Edited by Host>

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Later...
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Message was edited by: Missy Steph

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Message Edited by Pitini on 07-20-2009 12:43 AM
Message Edited by Pitini on 07-20-2009 12:49 AM

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