IBook only recognizing hard drive sometimes

Hello,
I have an iBook G4 that only sometimes recognizes the hard drive. I have even tried replacing the drive but it's still doing the same thing.
Does anyone know what part could be going bad?
Thanks,
Joe

Hi and welcome back to Apple Discussions!
If you have replaced the drive with a known good working drive and it still isn't recognized (how do you know it's not?), then you ought to target the ribbon cable (922-6124) which attaches to the hard drive. Replace that first. If that doesn't do it then chances are it is the logic board. The cost of a logic board replacement would probably be more than what the computer is worth, and wouldn't be a great investment.

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[Mac OS X: Available firmware updates for upgrading from OS9 to OSX|http://docs.info.apple.com/article.html?artnum=86117]
[Mac OS X and the Blue and White G3 Firmware Update Problem|http://lowendmac.com/lab/05/0301.html] - installing Firmware 1.1 on B&W without OS9 installed.
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[Formatting & Partitioning a Hard Drive in OS X - Tiger and Leopard|http://www.kenstone.net/fcphomepage/partitioningtiger.html]
[Journaling, Zeroing, Partitioning & OS 9 driver|http://forums.bombich.com/viewtopic.php?t=4084]
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