Was your logic board recapped properly? If not, then do that first, and also clean the PCB very throughly before you solder the new capacitors. They used a type of capacitors on these machines that are prone to leaking and shorting out the logic board after 15-25 years or so.
Otherwise, it is also very likely a logic board problem, more exactly it could be a Bourns filter problem. So that needs to be replaced.
As the Larry Pina in the book The Dead Mac Scrolls says:
[quote]'''Symptoms:''' On startup, the desktop appears, but neither thekeyboard nor the mouse work.
'''Typical history:''' The problem occurred when you connected ordisconnected an ADB device while the computer was on.
'''Probable diagnosis:''' The problem is on the Mac SE logic board.
'''Solution:''' Check/replace the shorted fiIter (Apple part 155-0007-E) at board location A 11
[image|1686992][/quote]