No, it was on stack mode with 2 other summit 400, when we close the colo we just turn them off and move to our office, Sold the other two and now I wan to use this switch and it gives that error. I also see on the back that both stack lights are stady on green. I have also try upload image using xmodem upload and it just get stuck as well, it never finish. When I go to bootrom and press h for help all that works. Hopefully is not a hardware failure.