So it was working and now its not and remarkably by mucking around with items that you had not messed with before the things going to work. The clue here was the leaky battery and the fact that it had finally eaten enough of the board to bust it. Cleaning and removing won't solve the problem, no matter how thorough you are. If you are serious about the board then get it checked and the traces repaired cus that's the problem. Otherwise you will be likely to damage even more of the 2000 pulling stuff out and shoving it back in. Its an electrical issue and so get the board checked. The kit is old.
For me I tend to track down a working motherboard. Always works.
For anyone with old Amigas then do check them for battery leak and really always remove them if they are the barrel type. There are many ways to do this. I just rock them very gently backward and forward until they snap off. I use vinegar to clean and neutralise with baking soda
Amiga4k posted this some while bag on the forums..
The best way to neutralize the battery leak
(1) Remove the board
(2) Clean by either method with toothbrush, brushing in the direction of traces, NOT across them
(a) Spraying with vinegar
(b) using a 3 part Baking Soda and 1 part distilled paste
(3) use different toothbrush to rinse and brush with distilled water
(4) Use litmus paper to test for alkalinity. When the red paper remains red, the solution has been neutralized
PS I have had repaired boards sprayed with circuit board lacquer.