I have an HP Elitebook that connects to a logitech usb mouse when attached to docking station. The touchpad on the keyboard moves the pointer, but the left and right mouse buttons do not work. There are two sets, one below touchpad and one above at the keys and neither work. The stylus buttons work and the usb mouse works, however without touchpad it is difficult to use when not docked. Could usb mouse install interfere with touchpad? Thank you for any help.