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The original iMac G5 needs to use its OS X 10.3.5 DVD. If you've lost that DVD you need to get a replacement or buy a 10.4 DVD.
 
chillybanana said:
Someone is going to lend me there 10.3 cds, wont that work?

thanks
The plain 10.3.0 CD's won't work. I don't know which version of 10.3 was last sold via retail.
 
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