Why macBook pro does not detect 2nd / 3rd monitor ?

Check how many displays you can connect

If you’re connecting multiple displays to your Mac, use the Tech Specs page to find out how many external displays your Mac supports.

  1. Choose Apple menu  > About This Mac, double-click your serial number, then press Command-C to copy it.
  2. Go to the Tech Specs page, click the Search Tech Specs bar, press Command-V to enter your computer’s serial number, then click Search.
  3. Click the specs page for your Mac. The number of displays your Mac supports appears under Video Support or Graphics.

Leave a Reply