![]() ![]() The same malaise hit my external monitor today. On a cantankerous note, I feel obliged to note that the prevalence of this issue (assuming a google search is representative) is disappointing given the expense and corresponding implication of quality of Apple hardware. Since the first time I stumbled on this solution, the MacBook has repeatedly failed to detect the external monitor (usually a few days after the issue last occurred) and these steps have resolved the problem every time. Wait for the MacBook's screen to briefly flash black.Plug the monitor's HDMI cable back into the multiport adapter.Turn off the monitor (it was not necessary to unplug it). ![]() ![]() Unplug the monitor's HDMI cable from the multiport adapter.I confirmed that the monitor and HDMI cable were fine by connecting them to another computer, tried two different multiport adapters ( this one from StarTech and this one from Anker) in all four Thunderbolt ports (notably, all the non-HDMI ports on these adapters have consistently functioned without issue), reset the NVRAM (as suggested in Apple's troubleshooting instructions for external displays), and tried power cycling the monitor as suggested in the top answer. I recently experienced the same issue: a new work-issued 16-inch Macbook Pro stopped recognizing a Dell monitor connected using an HDMI cable and a multiport USB C adapter. ![]()
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