My girlfriend seems to have forgotten her password which normally wouldn't be a problem, boot from the install disk and reset the password. However, it doesn't seem to be that simple. I put the SL install disk in (she isn't on Lion yet) and I hit restart on the computer. When the tone goes I hold the c key (as I've done on my mac before with no problems) and it seems to continue booting. After about 3 minutes, however, the screen darkens and a window comes up saying that the mac needs to be restarted. When that is done it boots normally, not from the install disk. I've never encountered this before and am not really sure what to do. I've also tried going through the install menu on the disk itself which asks for the password (no good for obvious reasons). I've also tried changing the startup volume and holding option during boot and selecting the DVD. Both resulting in the same as described above. Would love some help ASAP, thanks.