Can't access filesystem from PC anymore
I had the same issue with my phone. The USB cable was fine (I checked it with another phone like you) but when I tried it with my phone, it only charged my phone without showing any option for connection. It turned out that the usb port (usb connector) of the phone was damaged. Out of the two usb data wires (not the power wires), one was broken. I would therefore  suggest you to get your tablet's usb port (connector) checked.