Most displays will report "no signal" when the signal presented is present, but out of range. This may not result in a displayable picture on the external display. This is often difficult when the displays are [√[ Mirrored, because the resolution selected will be a compromise that can be handled by the built-in display. But this may still not be enough to get a picture on the display. Your Mac is aware of its capabilities and knows what resolutions should work. This indicates that the display has been detected. The above shows that the display has not been seen, and you MUST fix this problem before proceeding. Even if there is no picture on the display, the Mac should acknowledge that a display has been attached and show you its make and model.Ībout this Mac > ( More Info ) > Graphics and Displays This is a required intermediate step on the way to getting a picture on the display. The Mini DisplayPort/ThunderBolt adapters must be inserted into the socket so that essentially ALL of the metal part disappears inside the socket. To get these adapters to external displays to work, there are a number of factors which must all come together.
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