Here's how to install the RAM and hard drive: http://www.xlr8yourmac.com/systems/iMac_g4/iMacg4_takeapart.html
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I'll need to know your current RAM configuration to be able to tell you how much RAM you'll need for 10.4.
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I'll need to know your current RAM configuration to be able to tell you how much RAM you'll need for 10.4. I would also replace the 3.6 volt PRAM battery while I was in there.