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Sorry, there was a problem. Please try again later.Hi there, Sayed. Thank you for sharing your experience with us regarding the LG Monitor, Model # 27U411A-B. We understand your inquiry about the monitor entering sleep mode when connected to your PC. This typically occurs when the monitor is not detecting an active video signal. Please ensure that your HDMI cable is securely connected to your PC's dedicated graphics card port and that the correct Input is selected in the monitor's settings. https://www.bestbuy.com/product/lg-27-ips-fhd-120hz-monitor-with-hdr10-hdmi-black/JJ8VPZKPZ6 If you have any further questions about its features or need further assistance, please send us a private message on Social Media @LGUSSupport, and our team will be more than happy to assist you. —Renzo
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