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Monitor goes blurry in and out

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I have an ACER H234H 24" monitor that has been great with no problems, until now. It is roughly 2 years old. The monitor at times goes blurry and after a few seconds it is okay. At first I thought it was my eyes, but today my grandson asked me why the letters on the monitor were going blurry. The settings show that the resolution is 1024x768 and it is a Plug & Play monitor on ATI Radeon 2100 graphics.

Hopefully it is NOT my monitor but with my luck it will be. Hopefully someone can help.

Thanks :)
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I believe the resolution should be set at 1920x1080, (not 1024x768).
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You should get a clear resolution even on 1024x768.
If changing resolution does not resolve it then you need to try the following:

Try another monitor. If problem goes away the the monitor is bad.
Try safe mode (uses default drivers). If problem goes away then vid card is probably bad.
If a video card issue, you can try updating the driver.
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