USB Keyboard not working after sleep I use my MacBook pro with the lid closed and two monitors. I have an external Mac USB keyboard, too. Before the Catalina upgrade, I was able to wake the computer using the external keyboard. Now, after I put the MacBook into Sleep then reconnect to my monitors & keyboard the keyboard does not work. Loss of external monitor display I use an external monitor to my MacBook. Until yesterday, whenever I closed my MacBook, the external monitor continued to display my MacBook screen. Great. However, this morning this has stopped working. When I close my MacBook, the external monitor goes dark and reports no input. Step 1: Identify the video ports on your Mac Before you can connect displays, you need to know what type of video ports your Mac has. The ports you have determine what kind and how many external displays you can connect, and how you connect them. Use the table below to determine what video ports your Mac has. When you plug an HDR monitor into your Mac with the system version of MacOS 12.3.1 or newer version even 13.0.1, the HDR model won't work properly. Issues: HDR content can't be displayed in HDR mode. The screen is grey and yellow. While the internal display of Macbook Pro 2021 M1 is working great and displaying HDR content great as usual. Hardware: To confirm that your Mac is not detecting the external display, go to the Apple menu > System Settings > Displays with the lid on your Mac open. You should see two windows — one for each display. If you don't, follow the steps below in order. Everything works fine except that Windows does not let me control the brightness of the external monitor. If I use "Extend these displays", the "Adjust brightness level" is greyed out. If I show only on the external monitor, the brightness slider becomes available but has no effect. In Device Manager there are two display adapters: "Intel HD 68avi4x.

mac not working with external monitor