Re: Changing screen resolution to 1400x900
I feel a total idiot, but, yes, it's 1440x900, and not 1400x900.
In the oxrg.conf file with the deleted custom mode line I replaced all instances of 1400 by 1440. Ctl+Alt+backspace gave me a screen resolution of 1440x1024, and I then used System>preferences>screen resolution to select 1440x900.
Thanks for all your help and patience.