Guest les24preludes Posted December 10, 2021 Posted December 10, 2021 I have a 2009 running 5.1 Sierra. Cinema display HD LCD Resolution: 1920 x 1200 My Mac display switches off after around 8 hours in the morning while I'm asleep. Won't start with mouse or keyboard, or if you switch the computer off and on again. Only way to restart it is to disconnect and reconnect the screen connector to the Mac Pro. This seems to boot up the screen again. I'd like to fix this - how do I do that please? Source: MacRumors
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