if it is running it's original software that juke is going to be set up for commercial use only and you must be an operator and have an account with NSM to use it.
it needs to be hooked up to the internet to NSM's servers for verification and music updates. if it's disconnected or blacklisted becasue it's been sold or disconnected for too long... it will disable itself. in order to use this as a home unit, you would then have to nuke the NSM software out and install your own.
if it's already had windows or whatever installed and it's running some program other than NSM's juke software... then you might be able to do something. otherwise you have a great big paperweight.