I have connected my new HP 24 mh monitor to my Microsoft Surface Pro 6 using a HDMI cable connected to my tablet using a RayCue HDMI/USB connector. Monitor turns on, but message reads "Input Signal Not Found." I feel certain that I have made all the correct connections because message appeared on laptop screen indicating that device was being set up. My Surface Pro only has an USB port, so I do not have the option of connecting the monitor to my tablet directly using either a HMDI or VGA cable.
RayCue HDMI/USB connector is the killer definitely it is not compatible either way. I till can't work out why you have to " using a HDMI cable connected to my tablet". Do you mean tablet is your Surface ?
Your Surface has miniDP port and your monitor has DP 1.2 and HDMI ports all you need is
Be alert for scammers posting fake support phone numbers and/or email addresses on the community. If you think you have received a fake HP Support message, please report it to us by clicking on "Flag Post".