I'm well acquainted with the above trick. In fact, it's saved my rear end a few times when I got stuck in the "OS 9" trap on a computer that didn't have OS 9 drivers on the disk or had some other configuration change that prevented booting into OS 9. I have, however, had a few occasions recently where it didn't work. Specifically, I was playing around with my new Cube last night which has a CPU upgrade. I don't know the specifics, but I think it's 7447A based(it's 1.5ghz). In any case, I stupidly tried to boot it off of OS 9, which hangs near the end of the boot process because(I assume) it doesn't have the correct extensions to boot off the CPU(my Sonnet dual 1.8 upgrade "tricks" the computer into thinking it's a different processor than it really is to allow OS 9 booting). It seems, however, that the "X" trick doesn't work on the Cube. I probably will need to boot off a Tiger CD(there's no DVD drive in the computer) but am also afraid that I'll run into other issues with not having the correct CPU drivers...it looks like I may end up having to go in and do a TDM boot and manually "unbless" the OS 9 system folder, or otherwise pull the drive and boot off it in another computer to rebless the OS X system. Does anyone know when the "X" shortcut was introduced?