I have new iMac with Retina display. I connected an external monitor,External Acer S277HK. It works fine once it starts up but the computer and monitor take 5 to 10 minutes to start. Can anyone help me?
iMac with Retina 5K display, OS X El Capitan (10.11.6)
You have 90 days of complimentary AppleCare telephone support. This would be a good time to use it. If you are in the USA, here is the link that explains it. http://www.apple.com/support/complimentary/ If you are outside the USA you still have the same support, look in the documentation that came with your computer for information and if you cannot find it there, please click https://locate.apple.com/country
Thanks, I have called them many times and they don't know what the issue is.
External Monitor
