Create yourself a new, admin, account and log into it.
If all is well, resolution wise, then move all your documents, music, pictures, etc., over to the new account
Hi, my old iMac (10.4) suddenly changed the resolution of my display and I can not change it back. It only happens for my account, and not for the other two accounts on the same computer.
I went to system preferences and display, but the resolution is already the highest.
Can somebody help ?