Suerob09 Said:
"Thanks for the tip but it didn't work with the screen plugged in.. Looks like I need to fix the cable issue first"
-------
You are welcome.
Troubleshooting Video Output and HDMI:
A. Use a 4K Cable:
4K is what you are looking for: Belkin UltraHD High Speed 8K/4K HDMI Cable (2m) - Apple
B. Restart the Mac:
Having just installed the update, restart the Mac.
C. Single-Out this User:
Try an Admin new user, see if you do not get this occur while in it. If so, then it is an issue with the configuration of the current user. If not, then it is an issue with the entire Mac.
D. Reset the SMC and your NVRAM:
(Applies to Intel-Based Macs Only) Sometimes when changes are made to the system(i.e. updates), system configurations (i.e. for Ports) become manipulated, technically. So, reset the SMC and NVRAM.
E. Boot into Safe Mode:
When you boot into Safe Mode, items load by default, with certain settings and caches set aside. Go here: Start up your Mac in safe mode - Apple Support