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High frequency sound out of monitor

\015 When screen resolution is lower than 1152X864 32B or every 16B then monitor starts to make very high frequency sound waves. i do not know what to do, please help\015

Answers :

Tell OS and monitor model...?
\015\012
\015\012set this configration in win xp os...
\015\0121024by768 pix
\015\01232bit
\015\012and go to display properties=>advanced=>monitor=>change the frequncy....
\015\012some CRT monitors not support..
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High frequency sound out of monitor


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