> >> One one I'm aware of is Screen Spanning Doctor and it rewrites part >> of the Firmware, which voids the warranty. I remember reading about >> someone having trouble with Apple on a non-video related warranty >> repair after Apple discovered this hack was installed. > > It doesn't "rewrite" your firmware. It just changes a firmware setting > by storing the new value in NVRAM (non-volatile). All you have to do > is change the setting back if you need to get warranty support and no > one will know the difference. > > Phil Unless you can't start up or log in to change it. :-) JeffW.