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Make sure your connections from your video source to the monitor are solid on both ends. If that does not fix then try a different cable or port. If all else fails then it is safe to assume that your monitor is defective and you should consult your warranty.
Sorry, there was a problem. Please try again later.Please contact Acer support for assistance with your Acer monitor. Contact information is posted here for your convenience: https://www.acer.com/ac/en/US/content/service-contact
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