Controller DJI mavic pro - constant beeping sound

Good day to you all! This is really a struggle.
I have a standard controller for a DJI mavic pro.

Can’t turn it on. When connected to a charger, the display lights up and shows me that is charging as it should. ( I can say this because it goes gradually towards 100-%). When I disconnect it fro
The charger, it goes black.

I tried to disconnect to battery. Now when I put the main power cable from the battery into the socket( the white socket on the picture), it starts making the beeping sound - non stop. Like “beeeeeeeep”. Wouldn’t stop until I disconnect the cable.

So my dear fellows; where does the problem lies…?

Thanks so much in advance