Imac G5 - blue "world" in square flashing on screen on start up

I was trying to re-install my os disk and it said it would delete my harddrive -so I tried to quit it or eject the disk and could not -
hard powered off
now I have a square with a blue "world" flashing in the middle of the screen and can't get it to do anything.

The maximum operating system you can run on it is 10.5.8.
The maximum installer disc you can put on it is 10.5.6 which looks like * and does not say Upgrade or OEM.
The original discs that were prebundled with it, would say iMac G5, and are the only way to get Classic installed on it, if you have 10.4.11 or less on the machine. With 10.5 or later, there is no Classic compatibility. An external Firewire hard drive or second partition with 10.4.11 or less will also run Classic if you have the prebundled discs. Those prebundled discs would also include the minimum operating system that can install on it, Appleworks, as well as the minimum iLife, and a hardware test you can't get otherwise.
That machine shipped May 3rd to October 12, 2005.
The only retail 10.4 installers that would work on it look like * and say 10.4.3 or 10.4.6 on them, and do not include iDVD, Garageband, iWeb, iPhoto and iMovie. For those you either need iLife '06 or later, or the prebundled discs that came with it.
- * Links to my pages may give me compensation.

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