HT1338: OS X: Updating OS X and Mac App Store appsLearn about OS X: Updating OS X and Mac App Store apps
Currently Being ModeratedNov 17, 2012 5:36 PM (in response to keviande)
A PowerBook G4 can only be upgraded to 10.5.8. Retail DVDs are available at places such as eBay and Amazon.
Currently Being ModeratedNov 19, 2012 11:14 AM (in response to keviande)
OS X 5 as it implies for printers typically means Mac OS X 10.5. The only problem is, some 10.5 software only is designed to work for Intel, and some for PowerPC. Can you verify if it is PowerPC or Intel from HP's website? What printer model are you looking at? Note, upgrading to 10.5 or later, you will lose access to Mac OS 9, the Classic environment, but you'll still be able to boot into 9 if it was possible before, as long as you don't erase your hard drive without 9 drivers. Backup your data before performing any upgrade.