Problem with multiple screens

I added a second monitor to my iMac. The iMac seems to have difficulties to recognize the second monitor when it comes out of power saving mode. Sometimes I have to restart the computer one or more times before the second screen begins to receive the signal.

I use a cable thunderbolt and the second monitor is a BenQ GW2760HS

Any suggestions?

Unless your external display is equipped Thunderbolt you probably have the wrong cable. Please use an adapter (VGA, HDMI, etc.) mini-Display in the Thunderbolt port on the computer and then connect the appropriate cable. Then follow the directions of the Apple in use several screens with your Mac - Apple Support

Tags: Mac

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