Processor speed must be 867 MHz or better. Your 400 MHz is tapped out. It probably has USB 1.0 which inhibits syncing. On Mar 29, 2010, at 12:10 PM, Theresa Roth wrote: > How do I tell if my G4 is upgradeable to 10.5? I had been told > somewhere > along the line that it is not possible on my computer. > Theresa Wayne Dobson pwdobson@xxxxxxxxxx (519) 474-1253 res. (519) 860-2725 cell --- Manage your account options at //www.freelists.org/list/muglo