How can i reinstall mac osx

Hello
i want to install macosx tiger on my iBook G4 12"
The installation dvd is the original provided with the iBook.
Currently i have macosx 10.4.
The probleme is that this computer was repaired by apple (motherboard changed) but they created an account that doesn't appear in the account preferences and that i cannot remove.
Plus other folders with backup, etc....
I want to erase all those s*s to have a clean system.
thanks for your help

there are some problems :
1. I can't make partitions or erase my hard disk
2. I can't make an Instalation from dvd
3. I've erased all i can manually from the hard disk and start with "C" pressed to start from dvd (like it's written!) and... i have a kernel panic ! ooooohhhh...
Conclusion :
1a. The Installation dvd doesn't work with my computer
or :
1b. My computer doesn't like Installation dvds
2. Apple don't know how to repair their computers
3. Apple don't know how their computers was made and don't know the right dvd their computer need
4. Three weeks to be repaired et immediately back to be repaired again - fine, really fine !
5. My PC works. My iBook doesn't work.
6. My PC can be repaired. My iBook cannot.
If Apple can't do nothing better like this i want my money back !!!!

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However if you Software Update, Apple will bring your machine up to 10.6.8 automatically, with all the security and bug fixes. No choice to stop at 10.6.4 exactly.
10.6 is the Snow Leoaprd operating system, 10.6.3 or 10.6.4 or 10.6.8 is the updates to 10.6 that also occur when you run Software Update under the Apple menu.
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I don't know what you want exactly, but I'll give you the links.
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Welcome to Apple Support Communities
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Greetings
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have a nice day
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How can i reinstall mac osx

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