When I try to change my display settings through system preferences, I see "loading displays" for a bit, then when it finally loads, all I get is a blank page, exactly like this: http://forum.macosx.nl/album_page.php?pic_id=1302 . I have a powermac g4 with a 450 MHz processor, and the CRT display that goes with it. All the other system preferences options work.