You could try a hard reset, but I don't have much hope.
If you have a removable battery:
1. Power off the laptop
2. Remove the charger
3. Remove the battery
4. Hold down the power button for 20-30 seconds
5. Reattach the battery and charger and then power it back on
If you don't have a removable battery, follow the same procedure until you get to step 4. Instead of holding down the power button, flip the laptop over and look for a pinhole. Insert a paper clip or something similar and hold down the button in that pinhole.