It still shows the mouse? Very odd. Turn off the device. Hold down the power button for 15 -20 seconds (count it out) and then turn on the laptop.
Another option to try is...
1. First make sure the device has been charged.
2. Unplug your charger cord.
3. Remove the battery.
4. Press and hold the "Power" button for 30 seconds and see if the device will turn on.
5. If it does, great, now plug back in the power/charger cord. (If it didn't turn on without the cord in, it should turn on once you it is in. Yes sometimes they will turn on, or try to turn on, even with nothing attached/plugged in.)
6. Now put the battery back in.
If none of this works, you may need to reinstall Windows.