changed screen resolution in error

Restart while pressing & holding the Shift key until you see the spinning cogwheel. Be patient this is a self diagnostic mode and takes longer to boot. It should boot with the correct resolution. After it does restart normally.

Thank you!

Apparently you did not set the correct resolution. Startup in Safe Mode. After it starts do not change anything, just restart normally. It should restart in the correct resolution.

Hi

I have the same problem as Henryhbmains and I have tried exactly what you describe without positive result.

One thing I do not understand is that Apple OSX does not have a "safety switch" like in other operating systems where you have to confirm within 15 seconds or the screen resolution will automatically switch back.

I have now wasted a lot of time and what I hoped to be my first time happily with a Mac turned out to be my first time with a Mac wasting a lot of time and getting so disappointed.

Would you have any other suggestions - that would be very helpful

Thank you

I got it to work now by doing a software update of the Mac OS.

Seemed to reset the display settings.