Monitor didn't wake up after sleep, now will not reconnect to PC.

[GrimGrinds]

Someone please help. I purchased the M22F monitor, recieved it last night, unboxed it, plugged it in, turned my pc on. The monitor is supposed to be a second monitor by the way. It worked perfectly for 10 minutes no issues at all. Went to make my daughter dinner, came back and the pc was asleep. Woke the PC up, my primary monitor and everything else came back up, but the M22f did not. Now it will not reconnect to my PC no matter what I do. I've tried resetting my PC, unplugging the M22F for several minutes from both ends of the hdmi, factory resetting the M22F. Before someone says something silly like "check your cables" I have tried everything simple. It was working perfectly fine until the system went to sleep so it's not the cables or connection. I turned off auto sleep on the M22F and many other things no matter what I do now the monitor just says "Input Signal Not Found". Tried to put in a support ticket but the HP website says my serial number is invalid. It's the only serial number on the Monitor so i don't see how thats possible but anyways as I said I just bought this yesterday. So I could go return it to best buy and get a different monitor that isn't HP and probably more user friendly, but this ones here and set up and I would rather just use it because it's not broken. Someone please help me.

[itsmyname]

@GrimGrinds --  it's not broken

But it is not working.  Sigh.

Do you have access to any other monitor that you can temporarily try, to see if your computer has a "video" problem?  

If you use the "Windows-key-plus-P-key" combination, does Windows show the two monitors?

If you use the Windows "Device Manager", does it list both monitors, and a "good" device-driver for your graphics adapter -- not a "baseline-generic" device-driver?