(I tried this on another thread, but it looks dormant, so re-posting into a new thread) Whenever I boot up the SL install disk (either plugged in via USB drive or remote disc from my iMac), I select English as my language, "Continue" on the welcome screen, and when I get to the portion where I have to choose a disk to install onto, my MBA's hard drive has a yellow triangle on it and a caption underneath that says "Mac OS X Cannot Start Up From This Disk". I've used Disk Utility to Verify and Repair, but still get the same result. My MacBook Air is a 2nd generation machine, 120G hard drive (45G free), and MS Office 2008 installed. Other than that (and all my music and files), it's exactly as it came from Apple when I ordered it. I was able to install fine on my MBP and iMac. Any help would be appreciated. Thanks!