You could always try removing and reinserting all the chips, cards and connectors in the A2000. This can cure old computers, especially if they have been subject to moisture of any kind (shed by the sea) which can have resulted in oxidation of contact areas. Check if the clock-battery has started to leak as that in time can render the computer non-functional.
Also try removing all expansions and see if the computer starts then. If it does - then add the expansions one by one until problem occurs.
I dont have any answers to your WinUAE questions.
Good luck!
/Patrik
