Old iMac that needs work, what should I do?

My children have been using our old iMac for games, etc. It's pretty messed up. I kind of want to start from scratch, erase everything, and install system 10.5. I see no reason to keep System 9, should I keep it on there? How do I erase everything and do a clean install?
Thank you.

Hey Karen,
I see no reason to keep System 9, should I keep it on there?
How old are your kids? I set up G3 iMacs for pre K - 2nd grade and use OS 9.2.2. There's still a lot of great/cheap software in thrift stores and garage sales that only run in OS 9. Titles like Living Books ( Grandma and Me, Mom and me,..) Cat in the Hat, Kids Pix ( Even the newest 4 Deluxe )
I kind of want to start from scratch, erase everything, and install system 10.5.
That would depend on if your Mac meets the system requirements. Your iMac would have to be 1 GHz and above. ( technically 866 MHz ) and have sufficient RAM.
Otherwise Tiger 10.4.2-11, iLife.
How do I erase everything and do a clean install?
Check out these sites:
http://support.apple.com/kb/HT2055?viewlocale=en_US
http://support.apple.com/kb/HT1545
Richard

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