Video playback problem when outputting to TV set

I'll try and keep this brief and to the point.
I have a dual monitor setup: my primary is an LCD monitor; my secondary is a 32" HDTV.
Playing all videos works perfectly in fullscreen on my HDTV, but when using Quicktime the movie won't display on the TV, but it does display on my monitor.
I've gone through all possibilities I can think of. QuickTime is up to date, my hardware is more than capable (proven further since it will play HD Windows Media Video perfectly) and there are no hardware issues. It's purely a QuickTime problem.
Incidently, the same issue occurs when viewing video in iTunes.
Any advice would be hugely appreciated.

A DVI > HDMI cable. (Same cable I use from MacBook > HDTV except with the MacBook I add a mini-DVI adapter.)
I can't use Detect Displays because, when the screen is blue, I can't see the screen in order to click that button.

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