A friend of mine has an iBook with a trashed screen. Long-term he's going to try and get a replacement panel from eBay, but in the mean time thought he'd use it to output to an external monitor. The will occasionally flicker on briefly, and if it does this it outputs to the secondary monitor, but as soon as the panel dies the signal to the external display goes. Is there a way (preferably without having to see OS X!) to output to _only_ the secondary display, disabling the internal panel completely? I suspect this is something that has to be done in System Preferences, but that's probably not going to be possible. Thanks in advance!