Mac Pro to HD TV Headache (DVI to HDMI)

Hey,
I'm looking to output my mac pro to my HDTV (cheap mans video output monitor). I got a DVI to HDMI connector and all the females and males seem to agree to the point that its all connected up rather well.
Only problem is that my mac pro only detects my computer monitor, not the TV that I've attached. Things to note:
- I normally run two monitors at 1920 x 1200. I just removed one and replaced with DVI > HDMI adapter going to TV.
* I can get the display to work in windows (although for some reason, although it outputs to the TV via HDMI the other screen stops working) so the connectors are working fine.
* I tried hooking up the monitor to the port, downgrade the res to something below 1080, then connected the TV again, no result!
* I couldn't get 1080 resolution on my screens as its not an option in the display preferences.
* Before anyone states the obvious (at this point even that would be helpful) I restarted every time I attached another display.
* I have searched google, apple support, and these forums and I feel im going insane.
To summarise, I havent seen my mac on the TV yet. Its staring back at me with a blank black. Not good!
Any help would be much apprecaited,
Cheers,
K

Hmm, maybe its my graphics card?
I've tried it both on a TV and a HD projector, getting the same result.
If i go to windows then set the resolution to 1920x1080 then it works, so cable and everything is good. Its just the Mac that doesn't pick up the display. If there was anyway I could force it to find the display or be able to set my resolution to 1920x1080 it might help!
Frustration is really setting in now!
Also, I remember a while back I got two new monitors. I couldn't get these to work until I plugged in my old monitors, reduced the resolution, then plug in the new ones. I dont know if its some bug with my computer specifically or its something more generic.

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