I am trying to do a clean install of Mac OSX 10.6 on a MacBook Air. It currentley has 10.5.8 on it. When I boot into the installer on the DVD and go to disk utilities the local hard disk is not listed only the DVD drive. When I try to continue install the box where I am supposed to shoose the drive to install on is empty also. I cannot figure out why! If I disconnect the DVD drive, and boot up with the system drive, it boots into Mac OS X 10.5.8 no problem and the disk utility shows the system drive there. I verified the drive and it is ok. What is happening here? FYI it is a macbook Air.