Mac Mini and LCD TV, changed resolution and now cannot use the screen anymo

hello,
I have a Mac Mini and and LCD TV which is connected via HDMI cable. I was playing around with the resolution settings (not very smart in hindsight) and managed to select a resolution that my TV does not support. I do not have another monitor or Macbook. Is there anything I can do to reset the resolution settings? I tried to reset the PRAM, but that didnt seem to solve the problem. I also tried starting in Safe mode but that didnt do the trick either.
Appreciate your help!

Arie, it may be possible to get to System Preferences via the keyboard. But you have to be sure the Finder is the foreground application. Is your Mac set to boot straight into your account or does it pause waiting for a password? If it boots straight into a user account, you can try the following procedure:
\- Restart the Mac (It should be hooked up to the misbehaving display in case that's not clear)
\- When it is done booting, type Cmd-Tab and then Cmd-Q. Do this several times. (Cmd-tab will step the Mac through all the programs that might be running. Cmd-Q quits them. Doing this several times ensures that only the Finder is running since the Finder can't be quit. This is important for the next step)
\- Type Shift-Cmd-a (This should open the Applications folder)
\- Type "sys" quickly (System Preferences within the Applications folder should now be highlighted)
\- Type Cmd-o (This should open System Preferences)
\- Type out the word "screen settings" completely (This should cause Displays to be highlighted in the System Preferences main panel)
\- Hit the Return key (This should open Display Preferences)
\- Hit the Return key again (This will clear any alert box that may have popped up)
\- Hit the Tab key once (This will shift the keyboard focus to the resolutions list)
\- Now start using the up (or down) arrow on the keyboard one press at a time. Each press of the arrow key moves to the next resolution in the list. Wait at least five seconds between arrow key presses for the resolution change to take effect. Hopefully, at some point, the monitor will light up with a stable image and you are back in business.

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Mac Mini and LCD TV, changed resolution and now cannot use the screen anymo

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