Leopard Install Disc won't restart into installer.

I have a G5 quad core and am trying to install Leopard from my family pack installation disc. My superdrive is malfunctioning and will not accept any discs (spins as though it's loading, clicks and tries again, only to spit the disc back out). I purchased an external DVDRW drive by USB quite a while ago because of this. I put the disc in, I can double click to install, it asks me to restart and on restarting it loads right back to asking me for my password. I have tried holding down "c" on restart and the Install Disc never shows up. I have tried holding down "option" on restart and only my hard drive shows up. I tried to load from another computer that I have assuming to share it's drive, but when holding "option" on restart it doesn't give me an option to pick a network.
I'm Lost, Please Advise! Thanks.

A PPC such as your G5 will not boot from a USB connection. However assuming that the other computer has a FireWire port, you can probably "borrow" its DVD drive to install Leopard, even if the other computer is an Intel. You will need an appropriate FireWire cable that can connect the two computers.
I would try the following:
Shut down the G5. Insert the Leopard DVD into the other computer, and restart the other computer while holding down the T key, booting the other computer into [FireWire Target Disk Mode|http://support.apple.com/kb/HT1661] . Connect it to the G5 and then start the G5 while holding down the Option key. This should boot the G5 into the startup manager, and hopefully you will see the Leopard OS X install DVD as one of the startup choices. Select that, and proceed with the Leopard installation. Be sure you pick the correct "Macintosh HD" (the G5's HD!) for the install.

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