Radio issues

What is your question?

I want to know how to troubleshoot the mylink radio in my 2014 Chevy Malibu Lt. I have a mylink radio in my car, but there is no display on the screen and the audio just comes like 3 seconds then it’s off. I have tried many people but still and I don’t wanna go to the dealership cause of the charges. I also got another one from eBay but still the same. I was checking if anyone can help fixing it.i have done everything I could but nothing changed

How long has your 2014 Chevrolet Malibu had this problem?

More than a month