Mac Studio 'forgets' it's connected to a Monitor and won't wake up

The Mac does not rely on windows-like side-loaded "Drivers" which are actually packages of resolutions and settings for a specific display. Instead, it goes straight to the immutable source -- it asks the display itself.

To get a Mac display to become active, you need the Mac to query the display, and the display to answer with its name and capabilities. Otherwise, the display will not be shown as present, and no data will be sent to the display. "No signal detected" is generated by the DISPLAY, not by the Mac.

This query is only sent at certain times:

• at startup

• at wake from sleep — so momentarily sleeping and waking your Mac may work

• at insertion of the Mac-end of the display-cable, provided everything on that cable is ready-to-go

• hold the Option key while you click on the (Detect Display) button that will appear in Displays preferences (from another display)

Yes, Grant Bennett-Alder makes some good points.., do you know the model number/name of the LG monitor in question/the one that’s giving you trouble.., then go

to the manufacturer’s webpage/website , then Support there, search by type of product ( monitor) and it’s model name/number.. see if there are any firmware updates/software updates for the monitor itself and how to apply them . as you haven’t given me a name and model for that LG monitor you’re referring to, and because LG has and does make many models/types/kinds of computer monitors, that’s all the help i can give you.. oh, and maybe wait gor a stable update to your MacOS ( whichever version you have/are running right now

John B

Modern Displays with multiple ports are sometimes busy scanning the other ports, looking for an input, and miss the query from the Mac. They need to pay attention to the port you are actually using, or they will miss the query.

Some displays have On-Screen Display settings that can be used to tell the display a computer is attached on a certain port, or a certain port should be highest priority. Changing those may make your display more responsive.

Some displays include their own private "sleep" settings for the display alone. This can allow the display to enter its own sleep mode, on top of the Mac's not sending it data. A display that is sleeping on its own can generally not respond to the Mac's query, and will stay dark.