pennstater

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I am currently using a MacBook Air (Catalina 10.15.6, Early 2014) and had it connected to a Dell P2419H as a second screen (external monitor) using a thunderbolt to HDMI and an HDMI to HDMI connection. It was working fine until I had to disconnect to use the MacBook elsewhere and when I tried to reconnect them, the Dell is not detecting the connection at all. I would appreciate any assistance with this. Thank you.

P.S. I am posting this in this forum as my primary device is a MacBook. If it would better serve in another forum, please feel free to leave a comment. Thank you!
 

Couriant

James
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The question is does the mac detect it when you connect the adapter? II believe you should be able to see it in System Preferences > Display?

Also, make sure that the display is set to Auto, or HDMI if you don't use the monitor for any other device.
 

pennstater

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Sep 25, 2020
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The question is does the mac detect it when you connect the adapter? II believe you should be able to see it in System Preferences > Display?

Also, make sure that the display is set to Auto, or HDMI if you don't use the monitor for any other device.
The Mac is not detecting the monitor. I even tried the clicking the "Detect Display" button but nothing happened. The Dell is set to Auto.

So this happened once earlier when I first connected the Dell to the Macbook and upon replacing the Thunderbolt to HDMI adapter, it started working. I fear if it is the adapter again that is causing the issue. I tried connecting the HDMI cable in another connection and it worked fine.

If it is the adapter, is there a recommended connection (i.e a direct thunderbolt to HDMI cable (rather than making it a double connecting from the adapter to an HDMI cable) or any other suggestions?
 

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