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fm250Flag for United States of America

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wave lines vibration problem lcd monitor

I have got  a new monitor that has an analog and a dvi connections but my laptop has only analog and hdmi outputs so I used the analog cable to connect because I don't have hdmi to dvi cable.  I noticed after several days that there are wavy lines on the monitor? is this lcd monitor faulty?  thanks!

the monitor is aoc 19inch
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thank you all for the comments. I tried to change from 60 to 75 - the other way around- and that reduces the lines, so I can hardly see wavy lines if I get very close to it. I will try it on another compute and see.  
you can make the htz whatever your vid card and CRT will support... if it causes a reduction, try going lower \ higher.
Be careful of going higher with the refresh rate HZ as it can damage the monitor. A refresh rate of 60 HZ is usually the norm for LCD screens.
Do you have a model number for this monitor, that should help in deciding the proper refresh rate through its specs.
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Make sure you do not daisy-chain any surge protectors or power strips for the LCD power supply/cable.