I tried to search for this, but had no luck since the forum search would not use the "SE" part. Anyway, I bought this Macintosh SE at a garage sale for $5. It has a bad OS I think. When I boot it, it has the welcome to macintosh screen, and then it gets a bomb, with a system error. * Sorry a system error occurred. * "System" * address error * To temporarily turn off extensions, restart and * hold down the shift key. I hold down the shift key and restart and the welcome to macintosh screen says extensions off, but then I get the same bomb again. Does this mean that the computer has a hardware problem, or I just need to find an OS 6.03 install disc and boot from that (can old macs do that?) and reinstall. I believe this is just the original Macintosh SE, this one, but I don't have specs on it, since I can't actually boot it. M# is M5010.