What happens if you turn it off? If you press the power button for a longer time than normal it will power off instantly. I had something like that too but after I powered it off it worked. Can you put a photo of the arrow you are talking about?
I`m not sure but there could be a broken wire, but that's ok because you can easily fix it by soldering it back. That happened to a lot of my speakers and it's a really easy job just be careful when you take it apart.