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That's not true, if you look back in the forums, my buddy SLO4SHO posted a question about his powerbook cd drive not wanting to accept my leopard disc, We read that it wasnt possible to use USB to install, and that was wrong, Put your copy of os x into the external connect it, and then power on your ibook, right after you hear the startup chime, press and hold the option key, this is your start up disk selection, wait a minute or so for it to load, it should show your hard drive and whatever OS is currently on it like Macintosh HD 10.4.11, and then it will show your copy of os x Mac OS X Install DVD 10.5.6 Leopard, and select that and then click the ----> Arrow, and continue to boot that way.
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