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Helpful answers
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Jul 29, 2011 4:18 AM in response to jamesyb123by BGreg,The only operating system you can upgrade to is OS X 10.5 Leopard. Snow Leopard requires an Intel processor, which the Powerbooks don't have. I confirmed the other day that you can still buy Leopard from the US online Apple store at 800-MY-APPLE.
Before you update, be sure you download any updates to non-Apple software that may be needed to run under Leopard.
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Aug 1, 2011 10:21 AM in response to jamesyb123by a brody,And even more important, backup your data at least twice, shut down, and remove any peripherals from the computer except power before the upgrade.