Tom, I think this might help, as I ran into a similar display problem with my Studio Display when I finally upgraded my MDD dualie to Leopard. It's from an Apple forum some years back, I think:
"There is a missing extension in System/Library/Extensions/ AppleNDRV(folder). For those who have Ati Radeon 9600 PC and Mac Edition, ATI ROM Xtender is missing in Leopard causing sleep and display problems. The AppleNDVR folder contains only two extensions (AtiDriver.bundle and ATIRuntimeDriver.bundle). You need ATI ROM Xtender from Tiger to have a correct display. Just put it in the folder and restart." Perhaps your G5 has this file and your wife's doesn't? --Bill -- You received this message because you are a member of G-Group, a group for those using G3, G4, and G5 desktop Macs - with a particular focus on Power Macs. The list FAQ is at http://lowendmac.com/lists/g-list.shtml and our netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml To post to this group, send email to g3-5-list@googlegroups.com For more options, visit this group at http://groups.google.com/group/g3-5-list
