power fc comander issues

[turbotim]

hi! i wrote this into the general forum, i think this is the better fitting place for this topic and i hope someone here can help me:-)just a short intro of myselfmy name is tim and i´m from germany. i´m driving a 1993 200sx s13 with the (over here in europe stock)ca engine. a few weeks ago i swapped to the sr 20, and thats where the problems startedok, dont know how to start, cause its kind of embarassingthe plan was to swap the engine and replace the stock ecu with a power fc (and of course the fitting main harness).but then, (was working on the car for 13 hours that day) i switched the poles from the battery and the power fc kind of burned awayso i bought another from ebay, and the car is running now. the only problem was, that the comander didnt work. it only showed the apexi logo, even if the engine was started. first i thought, the comander was damaged too, so i bought another one from ebay. but even the 2nd comander is not running, same as with the first, it shows the apexi logo, and thats it.does anybody got an idea why it is like that?as i said, the car is running now, but i cant adjust the settings, and nothingcu tim