Please try the following methods.
1.Are the buttons on your mouse working or nor?
2.Replug your mouse into cross hair, when it is powered on.
3.Firstly, connect controller (USB PORT1) and keyboard and mouse (USB PORT2-3) to Cross Hair,then connect Cross Hair to console.
4.Plug mouse into another usb port of cross hair, which is used for keyboard before
5.Use mouse without keyboard to see whether it is working or not.