Mouse Stopped Working I rebooted from XP to 7 today and my mouse stopped working. I heard the USB Device sound like when you plug in a device when I booted, when I got to the machine my mouse was lit, everything worked except the USB mouse. I unplugged it and plugged it back in and it still didn't work. I plugged it into a diff USB port and it worked. I plug it back into the other port it doesn't work but other devices in that port work. I assume if I reboot or remove the USB devices from device manager and let Windows auto-detect, it will be fixed, but why is this happening? Solved: Went into the device manager and under Mice it showed Unknown Device, so I right clicked and Enabled it.