I have lost the password and the DVD is not working on my old mac G4 500mhz, how can I get back my password?

I have lost my password and the DVD is not working on my old mac desktop G4 500mhz. I have tried use the boot up disk to change the admin password. But the DVD did not work. ( I did not touch this machine for years.) But i need retreive something , so I have tried the shell script in the terminal
1. fsck-y and the mount-uw to try to change and find the service directory's plist to change the password. But after I get the mount -uw, it show illegal option message.
What I can do now to solve this problem? in shell script or any other way?
Thx in advance.
Alfred

Hi,
A DVD drive that is not working after many years not used:
most probably dust on the little laser lens.
Take the drive out and if you can reach this lens: clean it with pure alcohol on Q-Tip.
Many people throw away cd or dvd players all the time because they stopped working, and very often it can easily be fixed by cleaning this lens.
I used to have a G5, where I couldn't access that lens. It was very sensitive to dust.
I have fixed it several times with compressed air. One time I didn't have canned air, but a bikepump did the trick.
If you have another mac, I'd try to access the G4 internal disk with firewire target disk mode.
good luck

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