I replaced the HD in my '98 macbook penryn model, then I accidentally loaded a Leopard upgrade DVD instead of the grey install disk to re-install my OS. I followed the instructions for formatting the drive in disk utility with the wrong disk, then when I tried to install realized my mistake. Now I am using the right disk but the computer doesn't recognize the HD as a location to instal, and I can't access the partitions tab in disk utility to check formatting/re-format. I get the message "disk utility has lost connection with disk management tool and cannot continue. Please quit and relaunch. The partition scheme is now listed as "master boot record" I have tried restarting holding down 'alt' and also 'c' with no results. Thanks!