I think we are all having trouble figuring out what wxactly you are doing or trying to accomplish.
Whatever you are trying to do or install, a G5 iMac is a PowerPC G5 CPU Mac.
OS X 10.6 Snow Leopard will only install and run on much newer Macs that use Intel NOT PowerPC CPU chips. Snow Leopard WILL NOT WORK WITH YOUR iMac!
The disc shouldn't have let you install anything as there are checks the system CD/DVD looks for before beginning an OS X system install.If Snow Leopard disc, the first thing it checks is whether or not the Mac, in question, has an Intel CPU chip.
Are you sure these are Snow Leopard Discs and not just Leopard discs?
OS X Leopard is 10.5 NOT 10.6.
Are these grey discs or "Official" Black Apple retail system install DVD disc?
Gray colored discs will not work. Grey colored dics are the original computer specific discs that came with the computer when purchased. They do not work with other Macs.
Did you receive any other gray colored discs that say would say iMac G5 or something similar with this Mac?
If yes, you could try and see if that disc will install on your G5 and you would be able to tell us what OS X version it installed. The disc might even say what OS is on the disc.
If you did not recieve an OS X 10.5 disc to re-install OS X 10.5,
You will need to find/purchase an "official" black OS X 10.5 Leopard DVD to install an operating system onto your Mac.
Try to make clearer what you are trying to do and we may be able to give you more informed help.
Message was edited by: MichelPM