Question BenQ monitor connected to Macbook says "No Signal Detected" ?

Feb 21, 2021
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I bought a BenQ EL2870U monitor. I tried connecting my Macbook (16 inch, 2019, OS Version: Big Sur 11.2.1) to the monitor's HDMI input. I used a USB Type C to HDMI adapter.
Mac is able to detect the display (System Preferences -> Display -> Gather Windows shows a dialog for the BenQ monitor). But the monitor shows a blank screen with "No Signal Detected" error.

I tried the following:
  1. Verify that the HDMI adapter & cable are working by connecting to another monitor.
  2. Plugged in a Firestick in BenQ monitor's HDMI input, and this worked.
Is this an incompatibility issue with Macbook and the monitor?
 

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