HT204154: Thunderbolt ports and displays: Frequently asked questions (FAQ)
Learn about Thunderbolt ports and displays: Frequently asked questions (FAQ)
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Apr 7, 2015 12:56 AM in response to koningsvarenby joe_7399,★HelpfulGreetings koningsvaren,
Welcome to the Apple Support Communities!
I understand that you connect your MacBook Pro to an external Thunderbolt display and everything works as it should while connected to power, but once power is removed from the MacBook Pro, the second display no longer functions. It sounds like you may be using this configuration with your MacBook Pro closed, otherwise known as closed-clamshell mode. In order to use a second display with your Mac portable in closed-clamshell mode, the Mac portable must be connected to power. Please refer to the attached article for more information. If this is not the case, please let me know.
Cheers,
Joe
