sudo nvram AutoBoot=%00
sudo nvram AutoBoot=%03
sudo nvram BootAudio=%01
sudo nvram BootAudio=%00
Yes, but with a cavaet: Now pressing any key boots the machine. I can live with that much more easily than I could handle auto-boot.
I think this is why Apple got rid of it. The chime is heard so little anyway as most people simply sleep their Mac rather than shutting it down.After reading this thread, I realized that I didn't notice the lack of a startup chime in a really long time because the only time my laptop is powered down is right after an OS update.