My mac mini went bad this morning, only displays a white screen with a ? folder. i believe it is a harddrive failure. Had Leopard installed on it. Mac Mini Core Duo 1.6 Ghz (superdrive model) 1 GB ram 100 GB harddrive When i put in the OS X 10.5 install discs (mac os x installer version 1.0.3 (116.1), the start up screen comes up, but then says "you cannot install this software on this device". i was able to run the disk utility, but it could not finish, gave the message: "Invalid Node structure" Why won't the disk allow me to re-install Leapord? i tried using the 10.4.2 install disks, but nothing happened, just the ? folder icon. if i erase the hard drive will i be able to re-install leapord? thanks.