I just got a Powerbook G4 (Model #A1001) and it's the first Apple computer I've ever owned, so I'm a little noobish here, being used to Windows and all. I'm trying to put a new OS on it, but when I insert the disc containing the .iso of the OS (OS X Leopard 10.5.8 was what I've read is best for my system), it does not recognize it as bootable (I've tried holding down both the C and Option key; the only bootable device I see is the HDD). I've read that I need to convert it into DVD format, whatever that means? Anyways, book specs: Current OS 10.3.9 Processor 800 MHz PowerPC G4 (1MB L3 Cache) Memory 1 GB SDRAM I cannot get on the internet with this OS for whatever reason. When I try to, I get an error dialog that says "The attempt to load 'Accessing URL: <url here>' failed." Also, for some reason, when I try to access Utilities, nothing happens. The "More info..." button on the 'About This Mac' dialog is also greyed out. I basically just want to upgrade this OS without wasting my last DVD that's large enough to hold the OS. It's a DVD+RDL (double layered). Can I use it to install the OS? Thanks in advance guys!