First of all, you should test the cable that connects your display to your Mac and see if that's the problem. If the connection isn't the problem, make sure your display is actually turning on and try unplugging/plugging in your cables. If it still doesn't work, try resetting your SMC (https://support.apple.com/en-us/HT201295) and NVRAM/PRAM (https://support.apple.com/en-us/HT204063) on your Mac.
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First of all, you should test the cable that connects your display to your Mac and see if that's the problem.
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If the connection isn't the problem, make sure your display is actually turning on and try unplugging/plugging in your cables.
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If it still doesn't work, try resetting your SMC [https://support.apple.com/en-us/HT201295|How to reset the System Management Controller (SMC) on your Mac] and NVRAM/PRAM [https://support.apple.com/en-us/HT204063)|Reset NVRAM or PRAM on your Mac] on your Mac.
First of all, you should test the cable that connects your display to your Mac and see if that's the problem. If the connection isn't the problem, make sure your display is actually turning on and try unplugging/plugging in your cables. If it still doesn't work, try resetting your SMC (https://support.apple.com/en-us/HT201295) and NVRAM/PRAM (https://support.apple.com/en-us/HT204063) on your Mac.