I need to do a clean install of Snow Leopard onto a MacBook Air already running Snow Leopard. (I only have a Snow Leopard DVD that I bought separately which did not come with the original purchase of the MBA). I found these instructions online: http://www.tuaw.com/2010/01/30/how-to-clean-install-snow-leopard/ "... instead of booting Snow Leopard while inside of Mac OS X, if you just directly reboot the computer off the disc itself (holding down the "c" button after the system chime, letting go when you see the Apple logo) you get a few more options. Once you've gone into the installer program, you'll see "Utilities" at the top, and if you select Disc Utility, you can see your hard drive. If you click on "erase" (like I did, with one hand over my eyes) you can wipe the drive clean with various security options, and then you can do a fresh install of Snow Leopard on your computer on a pristine hard drive." However, how to do this on a MacBook Air that has no DVD drive -- i.e. how do "you just directly reboot the computer off the disc itself (holding down the "c" button after the system chime". How do you do that on a MacBook Air? If I were on a MBP, I would stick the DVD into the drive, restart, and hold the C button down. But how do I do that with a MBA? I tried linking the MBA to the MBP's DVD, then restarting the MBA - but the MBA reboots off its own disk. I've used the above method to do clean installs on a MacBook Pro and iMac that have their own internal DVD - but just can't get it to work with the MBA's shared-remote DVD. Please help.