Older and cheaper monitors tend to grow a drop on the high voltage B+ circuit over time. This causes less voltage during the vertical retrace, and thus not lighting up the phosphors on the inside of the CRT very brightly.
Short Answer: You need a new monitor.
Edit: Oh, and for your knowledge, the B+ voltage on the anode of the CRT discussed above usually averages about 40,000 Volts DC. Do not attempt to fix yourself, as this kind of voltage can stop your heart.
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That was lame.
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