I often attach a larger monitor to my Powerbook when I'm working at home, and have, for the month or so that I've done it, just plugged it in with the Powerbook on. I recently read in the manual that you should turn off the computer before attaching/unattaching any monitors. I'm trying to figure out the reasoning behind this and whether it is really necessary. The only thing I have had happen as a result of not turning it off (I assume), is that one or two times when I unplugged the monitor, the cursor dissappeared causing me to have to restart the computer. Any thoughts, experience, or knowledge?