How do I reinstall OS on old Powerbook G4

I have a Powerbook G4 that was given to me by my father in around 2012. I have had it and have not used it.

It has had the operating system 'customized' by Mac technicians in Medford Oregon: Connecting Point.

They have created a shadow admin user account that is being difficult.

Since the machine is servicable and compact I want to see if there will be any interest from a Craigs List post.

So I want to do a fresh OS install. I do have install discs for Panther 10.3. It now has 10.4.1. How would I get it

back to 10.4 ? I believe it would be an asset for it to be able to have Classic (OS 9 and lower) compatibility.

I recently did get a buyer for a G5 tower that I bought new in mid 2000's that did have 10.4x with Classic

compatibility.

To piggy back; the AC adapter for the G4 Powerbook gets close to being over heated. Has this been an issue

with this machine? And, while I have an internet connection via ethernet cable to router, to cable modem, the

machine is not setting the time from network time servers. It complains about clock not being set right on start

up even when the time preference is to set to automatically set the time. Why would this be?

Thank you for time and attention.

JK