I let an over-enthusiastic hobbyist connect his A1200 to my A4000T via a Parnet cable that he had made the night before. Well the A4000T refused to boot after that. It was unusual because BOTH CIAs were fried. And I can tell you it was no fun trying to find a guy in South Africa who had spare CIAs, and also could solder them directly onto the mobo. I opened up the Parnet cable and he hadn't grounded it properly. I was not amused.
Annoys me everytime I open the case and see the scars: but the good ol' A4000T has served me well ever since.