...Wouldn't that cause the CRT to burn? Then again, if it would mean getting the colour back to normal, then I guess that's a small price to pay.

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The brightness can be turned way down, the main purpose of leaving the computer and monitor on is to apply normal working voltages to the electrolytic capacitors in the video amplifier sections and in the power supply. But leave the contrast control at a normal setting. Using a screen saver that moves images around continuously is another option as long as the saver does not sleep the monitor power mode after a timer expires.