Got one of these mice last weekend and installed it without any problems. Now it won't work: the cursor won't move as a move the mouse around. The red optical bit on the bottom is on and the green light on the base station is also on. I plugged it into the PS/2 port and have also tried it in USB mode with no luck. I can use a basic mircosoft wired mouse in the same PS/2 port. Can anyone help me?