By -
Send it for repair you will not be able to fix it yourself
sorry for stating the obvious, but are the sticks formatted to FAT32?
Probably yes since the OP already knows how to play from the flash disc.
Does the red light blink every time you plug in a drive? Even if you get a message or not?
This ^ it sounds like the port is either broken physically or moisture got within it.
Send it for repair you will not be able to fix it yourself
sorry for stating the obvious, but are the sticks formatted to FAT32?
Probably yes since the OP already knows how to play from the flash disc.
Does the red light blink every time you plug in a drive? Even if you get a message or not?
This ^ it sounds like the port is either broken physically or moisture got within it.