This will wake up the external monitor and the MacBook. Take any kind of USB device and plug it into the MacBook (I used an external media card reader).The whole system (including external display will go to sleep). If in extended desktop mode, change to mirror mode. Depending on the way you have your display prefs set, you'll either be in mirror mode or extended desktop mode.With your MacBook on and running, plug in your external monitor and turn it on (if the monitor isn't already on).If you want to use an external monitor with your MacBook in "clamshell" mode (but with the screen open), but don't have the peripherals, here's what to do: Don't know if this is a known thing or not, but I was pretty psyched about it.
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