Apple Imac G5 Wont Run Setup From DVD

hi guys ive got an apple imac g5
and for some reason it wont run setup from any of the mac dvd's or cd's i have
the superdrive spins up and it does nothing even when i press and hold the letter c' key on the keyboard
the spec is as follows
Imac G5 - 17/1.6/2gb/combo/500gb hd
any help would be greatfull
and another thing can i use my windows based pc to load the os via target mode useing firwire
thanks
jason

Another help source (if you haven't already done so).
Go to your OS Help Menu. In the search field type dvd or cd
Click on all the troubleshooting topics & Support Articles that pertain to your issue.
You can also do the same in Disk Utility. Open same up.
At the bottom left of the window, click on the purple button w/the "?" in the middle.
This will bring up the Help Menu.
===============
Try a different brand. Top forum favorites
CDs
FUJI
TDK
Verbatim
DVDs
Maxell
Make sure the DVDs are not dirty, smudged and/or scratched.
http://docs.info.apple.com/article.html?artnum=50448 How to Handle and Clean CD and DVD Discs
Your drive may need cleaning. Cleaning kits can be purchased from any store that sells CD/DVDs.
"can i use my windows based pc to load the os via target mode useing firwire"
Hopefully, someone more knowledgeable than me can answer that one for you.

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