Prez Art Gorski gives us food for thought. "Here's a reminder of all the different keystrokes you can use at startup and what they do. The interesting thing to note is that if you use a wireless keyboard you must press the key AFTER you hear the startup chime in order for it to work." See the article here: http://reviews.cnet.com/8301-13727_7-57570572-263/how-to-manage-os-x-boot-options-with-wireless-keyboards/?part=rss&tag=feed&subj=MacFixIt