I have a ROG G751J that I connect to a monitor with a VGA cable, but want to change it to a HDMI port to Display Port cable. When I connect the new cable, there is nothing on the monitor, waiting for a VGA cable to connect. Is my Dell monitor too old??
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There are really no monitors that are too old for external use. Serial terminal monitors that have a serial interface, that's about it. When you plug in an external monitor to a laptop running windows, remember to use the "win" + "P" key. This brings up the monitor source menu. You can select "computer," "duplicate", "extend" or "projector". Try projector, as this forces output to an external graphics port.
Also, If you are plugging in an HDMI monitor to DisplayPort and the HDMI monitor has a resolution above 1920x1080, you will need an active DisplayPort-to-HDMI adapter. Passive adapters will not be able to drive more than 1080p resolution. Also, make sure to set the monitor input to HDMI. Most recent monitors have multiple inputs. Make sure your monitor is set as HDMI as the input source.
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What is the model of the monitor you have?
da Cameron