Hello, please use the Seagate Installation Handbook. There is a trouble shooting section at the end of the document. Check for appropriate cables connecting related ports, SCSI IDs set differently for each device, proper termination, working power supply with correct voltage and polarity. The smoke may come from the electronics or just from burning dust. However, if the age of the electronics is a problem (as with leaking capacitors or batteries) prepare yourself for a prolonged tinkering session. Good luck!