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Please check if this laptop recognizes other monitors when connected through the Thunderbolt port. If other monitors are recognized, reach out to the Apple support team for further assistance.
Sorry, there was a problem. Please try again later.As of around 2017, I believe, Apple monitors will only accept input via Mac OS device or iOS device such as a MacBook or iPad Pro Even if you have the correct connection, the iMac screen will not accept a PC input
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