You may want to try "zapping your PRAM" or doing a bios reset in pc speak and the magic key combination is.....drum roll please command,option,p and r simultaneously of course (you may need help from a friend) and wait for four chimes then it is done or you could try command,option, o and f this will take you into the bios basically you get a grey screen and a prompt you can try this set of command to zap everything reset-nvram set-defaults reset-all is this a G3 or a G4 imac btw?
ryno
Paulʼs weblog - I live near Folkestone, Kent. Wed + father to 2, I'm a full-stack web developr, + I do js / node, some ruby, other languages etc. I like pubs, running, eating, home automation + other diy jiggery-pokery, history, tree stuff, telly, squirrels, pirates ☠️, lego, + time travel.