Need help trying to install OS X on older powerbook

I Just got a older PowerBook G4, 12" first model that came out i believe. The dvd drive works but doesnt work. When I boot on the laptop the dvd drive makes sound so it works, but when I try to put a disc in, it doesnt read that im putting a disc in so it wont grab the disc. Im trying to install OS X 10.3, downgrading from 10.5.8 because it runs slow so I just want to do a test. My buddy gave me a .dmg copy of 10.3 to put on the laptop and he said to use disk utility to install it. I also have a 10.5 .dmg as well. Since I cant use the dvd, how can I go about installing through disk utility? Thanks in advance for any help.

You're not going to get any install help...since you don't own or didn't purchase your own install disks!

- Nick

Its from the real discs. He made me the .dmg files using disk utility on one of his macs. He has all the OS X disc and can install on multiple machines. But he gave them to me on my external hard drive before he left for a business trip. Thats why he couldnt do it and I dont feel like waiting for him to get back. So I figured I would come to a forum site for help. So thanks for being quick to assume im pirating.

You should reread Pigoo3's post!
"you don't own or didn't purchase your own install disks!"
Have a read....
http://store.apple.com/Catalog/US/Images/MacOSX.htm

RukiUki said:

Its from the real discs. He made me the .dmg files using disk utility on one of his macs. He has all the OS X disc and can install on multiple machines.

So thanks for being quick to assume im pirating.

Click to expand...

What you're doing is pirating! At some point in the process...most pirated software comes from "real disks"!

- Nick