Input Not Supported displays for Acer monitor/Acer laptop (working previously)

I have an Acer Laptop/tablet running Windows 10 (6 months old) connected to an Acer monitor (1 year old), via an HDMI cable. The monitor was working fine as an extended desktop until a few days ago (for the past 6 months). I checked the drivers; they are all up-to-date. I tried two different HDMI cables and tried connecting to a TV and it worked fine - both cables. I tried changing the resolution, but no change. I was unable to change the refresh rate (a recommendation from another user).  I uninstalled/reinstalled the monitor driver, but no change. The HDMI port on the monitor seems to be OK as the laptop recognizes when the device is connected.

When the monitor is connected, the device manager on the laptop only displays "Generic PnP Monitor" instead of the monitor model number "G276HL".  In the Settings, two displays will display onscreen, but when I click Detect, the system says it did not detect another display. When I remove the HDMI cable, the Multiple displays option disappear, so it clearly recognizes the input.

The monitor connects to a PC via a VGA or DVI-D connector with no problem.

I have wasted a lot of time on this to no avail. I can't drop my laptop/monitor off to the Geek Squad (or similar) as I cannot afford to lose that time (working on a contract).

Any suggestions, please and thank you??!!!

Misty KadwellAsked:
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Misty KadwellConnect With a Mentor Author Commented:
Thanks, Ramin. I am running the latest drivers. I uninstalled/reinstalled and still nothing. I also tried to duplicate the screen instead of extending. Didn't work. I am hesitant about doing a system restore.

Nobus - the monitor is an Acer G276HL and there have been no changes to the setup.

I just went and picked up a 4-port HDMI connector (I want to connect two displays) and for whatever reason, it works. I am able to connect the Acer monitor. It will not connect directly to the laptop, but it will connect via the connector.

Thank you both for your help!
RaminTechnical AdvisorCommented:
Can you connect that monitor to another PC via HDMI port ?
if it worked then you need to reinstall or update Display drivers from laptop manufacturer website.

and if it didn't work then it must be monitor's problem.

Did you try Duplicate mode / second screen only instead od Extend mode ?

If that is not a hardware issue then you can also try System Restore to restore your PC settings and drivers to before that issue,
was there any change in the setup of the monitor?
what model is it?
Seth SimmonsSr. Systems AdministratorCommented:
No comment has been added to this question in more than 21 days, so it is now classified as abandoned.

I have recommended this question be closed as follows:

Accept: Misty Kadwell (https:#a42371025)

If you feel this question should be closed differently, post an objection and the moderators will review all objections and close it as they feel fit. If no one objects, this question will be closed automatically the way described above.

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