Hey Octaedre,

Nice to see another french member!

Error #2 means Address Error and it could come from many things. It could be a bad RAM stick as well. The best for you would be to find your bootable floppy and try to boot the mac from the floppy. If you can't find it and can't make one, let me know, I can make one for you, with some hardware check programs and send it to you by post mail. As we are not far from each other it shouldn't be a problem.