I have a 2011 early model MacBook Pro (High Sierra 10.13.3) with a Thunderbolt port being the only way of connecting an external monitor. I use a Mini DisplayPort-HDMI adaptor to connect my LG IPS236 monitor. It worked great until I updated to Sierra, then it stopped workin. SMC was reset, everything was reset, I tried different monitors, tried different adaptors (Mini DisplayPort-VGA), different cables, nothing.
If I connect the monitor with the HDMI adaptor, the MacBook screen flashes black, than nothing happens. If I connect with the VGA adaptor, then there is no flash.
Tried reinstalling High Sierra, tried al the resets, spent hours on the phone with Support, nothing. I am suspecting the HDMI port might be faulty, but I don't know how to test it.
Anyone has any ideas?
Thanks