Once your Mac has restarted, resume the upgrade and see if you encounter further issues. If you’re in the middle of installation, cancel it first before restarting. If you’re using your Mac for study or work, finding a solution to this problem is a priority because you can’t do anything with a black screen.īefore you try the solutions listed below, try some of these emergency steps first to see if they work. There is no explanation yet why the macOS Catalina update caused the HDMI to stop working, and it will probably take a while for Apple to release an update that addresses this issue.
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How to Fix HDMI Signal After Catalina Update This guide will show you what to do if your Mac shows no HDMI signal after Catalina update.
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However, this doesn’t deny the fact that display problems such as these can cause a lot of inconvenience and annoyance. Mac users who are using HDMI for their second monitor are less affected compared to Mac mini users who use HDMI as their main connection. There are also some cases where the external display just blinks randomly when connected to a Mac running macOS Catalina. Other users, on the other hand, got a No Signal error message instead of the black screen. The display just turns black (or dark green in some cases) and eventually shuts down. Several users reported getting a black screen after installing the new version of macOS, even with the monitor still turned on. Some Mac models, such as the Mac mini, also rely on HDMI to connect the computer to the display.īut with the release of macOS Catalina, a lot of Mac users using HDMI connection reported encountering various problems after the upgrade. Whether you want to use a second screen or you want to export full audio and video display on your TV, connecting your devices is a lot easier with HDMI. You can connect the HDMI cable to the HDMI port on your Mac to a second monitor or TV. One of the ways to connect your Mac to an external display is by using a High-Definition Multimedia Interface or HDMI cable.
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