How do I revert my display settings without being able to see the screen?

I am using an Emerson led tv as a monitor, and when I tried to adjust the display settings to get a better resolution,I chose a resolution that wasn't supported. Now it is telling me to change the settings, but I can't see the screen anymore.

Reset the PRAM, as per > About NVRAM and PRAM
1. Shut down the computer.
2. Locate the following keys on the keyboard: Command, Option, P, and R. You will need to hold these keys down simultaneously in step 4.
3. Turn on the computer.
4. Press and hold the Command-Option-P-R keys. You must press this key combination before the gray screen appears.
5. Hold the keys down until the computer restarts and you hear the startup sound for the second time.
6. Release the keys.

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