Stuck on grey Apple screen, how can I erase and restore back to original?

I've been trying to restore my imac G4 flat panel back to its factory settings, as I have recently backed up my necessary files on an external hard drive. It came with Panther and I upgraded to Tiger, but now I don't have any of the disks. I don't care if it restores back to Panther, I just want to erase and restore it. I tried to download and mount the restore disc and do it from there, but now its stuck on the grey apple screen. Any help would be appreciated.

Hi Jared, and a warm welcome to the forums!
I tried to download and mount the restore disc and do it from there, but now its stuck on the grey apple screen.
Can you explain what that is, I've never heard of it being downloadable!>

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