New Mac w/Leopard can I erase 10.5 and replace w/10.4?

Just bought a new MacPro 2.66 etc. I have a powerBk G4 w/10.4 The new mac has 10.5 installed from Fac. Can I erase this and reinstall w/10.4? Is this ok to do?
The truth is, I have a lot of software running 10.4 and IT IS STABLE. I am not sure I want the hassel of upgradeing, spending more $ and time to deal w/problems right now. Busy, busy busy.
the
rocketshipjack

Rocketshipjack
I wish I could help you, but I ran into problems when I tried to re-install 10.4 on my iMac G5 2.1 ghz. Like quite a few Mac users, I have run into various problems/issues. When installing Leopard, I did an "Erase & Install", but still experienced several of the issues others on this board has mentioned.
So, to get back that happy and content feeling I have had since I switched to Mac a few years ago, I decided to re-install Tiger. But - no way.
When rebooting my iMac with the Tiger installation DVD, it after a while replaced the grey apple in the boot-up window with an icon showing a forbidden sign (you know, the "O" with a slash through it).
A little frustrated, I ejected the DVD, continued the boot and then tried again. Same thing - full stop and I was not allowed to continue. I may mention that I am not talking about an upgrade/downgrade install - I didn´t even get to the point where you can begin the installation and make a choice.
I then restarted with the Leopard DVD and from the menu found the disk utilities and erased the disk (no turning back now - lol), hoping it would wipe Leopard and leave the disk clean enough for Tiger to be installed.
With the Tiger DVD in the computer, I restarted again. With a sinking feeling I got the same "forbidden" sign in the boot-up window. That is when I was becoming a little sad, since I had run of options (at least the options I knew about).
I managed to eject the Tiger DVD and had no choice but to reinstall Leopard. However, now I suddenly got the choice to "Install OS X for the first time" during the setup process. Since all my stuff was erased anyway (yes, of course it was backed up when I started ), I chose this option.
And the funny thing is that I have a feeling that Leopard works slightly better now. If it is due to the erasing of the disk or the fact that I installed the 10.5.1 directly after installing 10.5, I cannot tell. But it feels a bit better than it did the first time.
Why I was not allowed to reinstall Tiger, even after erasing Leopard first and on a computer that originally came with Tiger, I cannot tell. I may mention that I also did reset the pram, but it made no difference.
Again - maybe not helpful, but wanted to share my experience since I know your feeling
All the best,
Espen

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