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HP Notebook - 14-ck0521sa

Hi, I recently changed the monitor connected to my laptop via the HDMI port and it worked for a few hours but now I keep getting a message to say there is no HDMI cable (even though it is plugged in). I get the same message when I change back to my old monitor which has worked perfectly for years (with a VGA-HDMI adapter). I have tried all the options suggested online, including checking that the cables are working, making sure my OS is up to date, searching for new drivers, and of course lots of restarts and different connection sequences. My Windows version is 22H2 build 19045.2364. Would greatly appreciate any help!

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