I have recently added an extra monitor to my 800MHz iMac powerPC G4, I have the monitor up and working, automatically it is mirroring my desktop, however I want it to extend my desktop. Now if I go into my display preferences (OSX4.2) There is no arrangments panel and no button to detect other displays. If I search for mirror displays a panel comes up and says "your arrangements tab has been hidden as you only have one display" I have repaired permissions but nothing. Any suggestions? and please don't say my computer can't have two monitors nonmirroring!!