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flashing "?" mark, no start-up on a1144 G5 17"?

My 2005, a1144-G5, 17" has the flashing "?" mark, and will not boot! So far I hear it needs to be rebooted, or the operating system needs reloading. Tried the basic restarts with no luck! I have OS 9.1 "2001" but don't want to lose OS-X if it can be retrieved!

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Your 9.1 OS will not work to boot this machine.

Pre-Installed MacOS: X 10.4.2 (8E102) Maximum MacOS: X 10.5.8

Your best bet is to get a retail version of 10.5, boot from it and run Disk Utilities on the hard drive.

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Edward Hall crwdns2934231:0crwdne2934231:0
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