I have a Casio CTK 601 music keyboard and I can't switch it on

by MINDY
(MANILA PHILIPPINES)

I have a Casio CTK 601 music keyboard and I can't switch it on...

Before I have this problem with the sounds of my music keyboard I didn't use it for a long time and when I used it in these past few days I can't turn on the keyboard because there is no power.

I used a 9v AC adapter and it didn't work I also put 6 batteries at the back of the keyboard but still there is no power. I tried to open the keyboard but I didn't see anything wrong with the wirings or in the main board.

I don't know where the problem on my Casio CTK 601 music keyboard is.

Thanks!!