Leopard Will Not Install

I have a iMac G5 with 1.5gb ram, 1.8ghz speed. It's currently running OS X 10.3.9
Leopard does not seem to want to install on to my internal hard drive which has 23.45 gb of space left. When the installer gets to the point where you get to choose which drive you want to install on, my internal drive has a yellow triangle with the exclamation point on it. The installer tells me that the only way to install Leopard is to have it ERASE the internal hard drive. I have 2 external FireWire drives where I store my iTunes music and my Logic Projects and Video projects. The external drives do not have the yellow triangle so I suppose Leopard is able to instal there but that's not what I want. I want leopard on the internal drive.
I have tried the instruction in the "Only installation option may be Erase and Install" document.
-I dont' use TechTool
-I tried the instructions for Terminal but Terminal told me that that command dose not work.
-I tried to "repair" the internal hard disk with Disk Utility while booted on the Leopard Install disk. However, Disk Utility would not let me "repair" the internal hard disk. The "repair" button was dimmed.
Any Ideas? Maybe Leopard just can't be installed on these machines after all? Maybe it just can't be installed from 10.3.9? If that's the case I sure wish I would have gone to 10.4 at some point. (I do professional Music production with Logic and it works so well in 10.3.9 that I never wanted to upgrade the OS.
The main reason I want to upgrade is to use the new "Logic Studio". According to the box it will not run on 10.3.9. I wonder if thats' really true? I don't want to open the box to find out it does not.
Has anyone else had trouble installing Leopard on a iMac G5?
Should I call tech support? I have a feeling that they would just tell me to do what I've already done.
Thanks for your help.
Morris

Most stores have up to a two week return period with a restocking fee. Call the store you got it from to find out what return period and/or restocking fee you have.
As for the inability to install, you may have come across a situation where there is insufficient free hard disk space to install on your iMac G5.
I'd free up at least 7 more GB of hard disk space. I'd also follow my upgrade FAQ* as far as other upgrading tips including making two clones of your data.
http://www.macmaps.com/upgradefaq.html
Finally I'd get Alsoft Disk Warrior to repair your directory. It is possible the version of Techtool Pro you have is not yet Leopard compatible.
- * Links to my pages may give me compensation.

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btupper wrote:
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Remzin wrote:
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