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Macbook Pro wakes to purple screen

HP Recommended
HP 24 YH monitor
macOS 10.15 Catalina

My new monitor wakes about half the time to a purple screen. Turning it on and off brings back the desktop.

Early 2015 Macbook Pro, in clamshell (lid closed) mode.

Connection is HDMI with the HP cable.

"Input Control/HDMI", Auto-Switch Input was OFF, now ON.

I'd appreciate help on this. Thanks!



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