Some radios have anti-theft codes that turn the radio into a brick if you remove it from a car. When power is cut to those radios, you have to enter the secret code into them to get them to work again. The dealer may be able to help you get that secret code, or they may not. When we bought our current car years ago, we had the option of arming this anti-theft code in our radio. We didn't, but a lot of people do.
There's a chance that Monster's car has such a radio. If she bought it new, she should know. If it was used, she wouldn't know.
I know about this issue because I had a dispute with an ebay seller who sold me a radio that has been disabled. I think he had no idea he was selling me a brick, but it was a pain for both of us.
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