Help No USB connection with PC

[SimonThePieman]

Hello,

My Acer Liquid E2 (single sim) can't "connect" to my laptop. When I plug it in to my computer it starts charging and all that, but there is no usb icon on my phone and no popup on my laptop asking me what it should do.
When I go to settings>battery it says "Charging (AC)" instead of "Charging (USB)" and I think this is the problem. Does anyone know how to fix this?

Thanks