My Toshiba L55 won't boot. Power light comes on when you push the power button but nothing else happens. Screen stays black an

[sgwhite9]

My Toshiba L55 won't boot. Power light comes on when you push the power button but nothing else happens. Screen stays black.

 

[mets3214]

1. Take out the battery and charger
2. Hold the power button for 30 seconds
3. Plug the battery and charger back in
4. Turn on