Hmm... May I ask a question of you? Why do you think it is ROM related? The RED-screen is not an error that shows up too often. It *IS* listed as a ROM error, but, personally, most ROM related issues I have seen in my experience generated yellow screen errors. While RED screens were usually more difficult... :-( (In fact, only machine I ever saw a consistant RED screen error on had multiple problems caused by a power surge)
Some thoughts... This laptop HD adaptor you hooked up backwards.... Did you make sure you had it hooked up to the right pins, and that you weren't still passing power from your A1200 mainboard to your HD cable? Also, make sure that the adaptor isn't shorting power to a ground? Or that any pins on the A1200 mainboard are shorting together? Or that the adaptor is shorting against the metal RF shielding? The A1200 passes power in it's laptop-style connector, and shorting that power could have disasterous side-effects. Correcting the short may or may not cure your problems.
