Windows 10: Windows 10 not detecting 2nd monitor but it did before.

I have a new Lenovo AIO that came with Windows 10. From the start, it successfully detected a second monitor connected by HDMI. Yesterday I disconnected the second monitor in order to move to a new location. Now Windows is not detecting the second monitor. I've disconnected and re-connected the cable and re-booted but to no avail. In device manager it shows that I have the latest update for the display driver. Any ideas?

:)

 

Windows 10 update not detecting my 2nd moniter

I had just downloaded the windows 10 update, before both my laptop, and my 2nd monitor via HDMI was working, after the update however, Windows 10 doesn't detect the 2nd monitor, But my monitor detects its plugged into my laptop. Any help is appreciated
Im going to try restarting my laptop real quick though ill update this if it works

 

Windows 10 doesn't recognize my Viewsonic VA712b monitor.

No errors, monitor wasn't detected, no manufacturer updates. Before Windows 10 upgrade both monitors worked fine. After upgrade to Windows 10, too many programs and equipment no longer worked. Rolled back to Windows 8.1 reluctantly. Everything else
but my 2nd monitor is now working. What happened that my monitor is not recognized?

 

Win key + P will bring up the projector (second monitor) options. Can you extend or duplicate displays there?

 

Thanks for the quick reply. The answer is no.

 

Have you tried rebooting the computer with the second monitor disconnected. After the computer boots up with only the primary monitor connected, then connect the second monitor?

 

Also, judging from this photo, it looks like you might have both HDMI out and HDMI in jacks. Are you connecting the monitor to the out jack? In the photo that would be next to the LAN connection.

 

Aha! That was it. I was connecting to the wrong HDMI port on the computer. Thank you!!

 

Awesome . I worked for a cable TV company before joining the Navy in 1988. Got a trouble call that stated "Cable out since vacuumed floor". Walking in, pulled the power knob on the TV. Nothing. Reached behind the TV and plugged the power cable back into the wall. . It happens.

 

It's nice when fixes are this easy! Thanks again.