User profile for user: rose_10 rose_10 User level: Community Specialist Apr 24, 2018 6:34 AM in response to chona86 Good morning chona86! It sounds like you're having some issues with your Mac detecting the HDMI able being used for an external display. I'll be happy to help out. Here's some steps you can take that resolve many issues where an external monitor isn't being detected: Get help with video issues on external displays connected to your Mac - Apple Support Cheers! Show more Less Reply Link