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<DIV id=yiv101613560>I recently purchased a Power Mac G4 AGP 500MHz Single Core CPU, 100Mhz Bus, 60G Hard drive, 2G RAM (upgraded by me), running OS 10.2.8. I then purchased an upgrade Sonnet 1.8GHz CPU. The problem that I have run into is that the firmware that came with the new CPU requires that you boot from OS 9 in the Start Disk. I do not have OS 9. Apparently, the Seller of this unit upgraded the OS without using the original disks. I know very little about Apple products, but I really like this machine and I am anxious to learn a great deal more about this product since I find the OS is far superior to anything that Microsoft has. I need a crash course on this machine, particularly how to upgrade the CPU. I would also like to purchase the OS bundle that includes OS 9. Any information would be greatly appreciated.</DIV></DIV></td></tr></table><br>