On hold with Apple tech support now... After making sure my Macbook was properly backed up (Time Machine and cloned to external), I put the SL disk in. Waited the 30 minutes for the install and got the language selection window. Then, after clicking continue once or twice I got to the Install Mac OS X window where the hard drive SHOULD have been and that little white box is blank. Disk utility only shows my DVD drive. Not sure what is going on.... Seems that this happens with the original Leopard install disks as well so I am mistaken and this is NOT a SL issue. I did put in a Western Digital 320 gig drive as an upgrade an am pretty sure that I cloned my old drive to it. Wondering if there is a problem with the Mac recognizing the drive or a jumper setting that I need to play with. Apple care has been great and is still on the phone working with me on this. UPDATE: Installed by putting HDD into firewire enclosure and then back in after install was done. Seems to be working fine now.