Can't boot to graphics mode Zorin 12 after vnc experiment


I have a Zorin 12 that I was attempting to set up a vnc server on and now it won't boot up. I get the low graphics mode warning and I can't get any further than that although somehow I got logged in to a terminal window.

What can I do from there to troubleshoot and fix the graphics configuration? TIA

Unless someone else replies with experience, I did websearch and found this: xorg - How to fix "The system is running in low-graphics mode" error? - Ask Ubuntu

What graphics card do you have?