I suspect your PRAM Battery has died. When you do get your system running do you note the dates of just created/modified files are wrong? If so that confirms your battery has died.
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To replace it you need to remove the main logic board [guide|67|Removing PowerBook G4 Titanium Mercury Logic Board]. In Step 25 image you can see it in the top right hand corner with the white printing (not marked in the guide). Here's the needed replacement [product|].
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To replace it you need to remove the main logic board [guide|67|Removing PowerBook G4 Titanium Mercury Logic Board]. In Step 25 image you can see it in the top right hand corner with the white printing (not marked in the guide). Here's the needed replacement [http://www.ifixit.com/PowerBook-Parts/G4-Titanium-Mercury-PRAM-Battery/IF121-017|G4 Titanium Mercury PRAM Battery].
As you need to pull the heat sink off in the process I would take the time of cleaning and aplly a fresh coat of thermo paste and clean the system of any dust using a soft brush and can'ed air.
I suspect your PRAM Battery has died. When you do get your system running do you note the dates of just created/modified files are wrong? If so that confirms your battery has died.
To replace it you need to remove the main logic board [guide|67|Removing PowerBook G4 Titanium Mercury Logic Board]. In Step 25 image you can see it in the top right hand corner with the white printing (not marked in the guide). Here's the needed replacement [product|].
As you need to pull the heat sink off in the process I would take the time of cleaning and aplly a fresh coat of thermo paste and clean the system of any dust using a soft brush and can'ed air.
Make sure to follow proper ESD practices!
Let us know how it goes.