No, I do not. I was going by the information on everymac's page.
I've worked on many, many G4 systems but I was usually only interested in OS9 if I was working on the Classic side.
If I ever ran across a G4 with 8.6 I probably upgraded the OS to 9.
Uninorth refers to the chip that passes data between the processor and the memory. Uninorth was what Apple called the chip.
In a PC this chip is usually referred to as Northbridge.
But in this context it refers to the early grey G4 Macs. Most of them are capable of running 8.6.
This page has...
There are components on the mother board that can fail and cause the symptoms you are seeing, but it could also be the floppy drive.
You'll have to find some way to test the floppy drive with another computer to isolate the problem.
Or test another known good drive in your computer.
Look...
You're going to have to open the system and remove the floppy drive and do the cleaning & lube procedures outlined above.
There's also good chance that one of the tiny gears in the drive may need to be replaced.
You should determine exactly what model you have to understand exactly what OS it will run.
(Early models needs minimum 10.3.5 and the later model needs 10.4.2. They should all run 10.5.x)
There are several websites that will decode the serial number and tell you the model.
Replace the PRAM battery.
If the PRAM battery is missing or dead it will behave that way. (This will also affect sleep/wake as well.)
The regular battery probably has just enough juice to keep the PRAM from resetting.
Mac cases are not made of nylon.
Also I remember hearing/reading somewhere way back when that part of the reason the old Macs are so brittle is because of the flame retardant chemicals that were added to the plastics back then.
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