How do you want to use this unit? If it can't play disks, that's probably the reason it was given to you. You can open it and check whether you can replace the DVD part of it.
You can use it as a stereo receiver (eg connecting external DVD player thru AV IN connector), or as a radio. If you want TV sound to go thru it, you can connect "Headphones Out" of your TV to AV In.
This is an example of why I would not recommend getting any of these Home-Theather-In-a-Box (HTB) - when DVD/BD fails, you're left with shiny box you can't fully utilize.