This is an elbow joint that I replaced with a broken one. What could be some solutions to this issue?? I just started training and working with these robots so I am in need of some help.
Could be a communication error (connector turned 180 degrees or not installed correct).
If you go to Low Level Control and initialize the robot in there and then send a screenshot here, then it might be possible to tell some more. 
Check the service manual for information about Low Level Control etc.