Screen Resolution Will Not Stay Set...

Hi Gang:
I am trying to get my Mac to display 640 by 480 60Hz resolution so that I can input it into my television. I change the settings in the System Preferences /Display to what I want, yet every time I reboot it changes back to a different setting. I have been setting it up on a computer display monitor, is accepts the new resolution, then reverts back as soon as the computer is restarted. I have tried changing the resolution and starting it on the television upon a fresh re-start thinking it may sense the computer monitor, but still goes back to the higher rez setting. Is there a way to force the setting on the computer? very frustrating.
Thank you, Glenn

Hi.
The screen resolution and refresh rate are stored in the PRAM. If it's an Intel Mac you're dealing with, reset the PRAM by holding the CommandOption+PR keys at startup, until you hear the second chime). If you have a PowerPC Mac, then you'd better reset the NVRAM, by booting into Open Firmware (hold CommandOption+OF at startup), and type at the Open Firmware prompt:
reset-nvram (hit Return)
set-defaults (hit Return)
reset-all (hit Return)
The machine will restart. Set the resolution you want, and see if that persists after restarts now.
Good Luck.

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