Just to comment, when you pull out the bv, turn it upside down and toward the front of the transport, right under where the head sits, you will see a PCB. Sometimes, they put the program ID on the flash chip or eprom, but not all the time. If you have an eprom, swap it with an known ido 24 eprom, if you have flash, you need to find somebody with the flash tools to re-program the bv. But do what others have recommended, which is take the bv from a working machine and try it with this one to make sure it's a bv issue.