Welcome to Fixya.
I see that you're having boot issues, here are some other things that you can try :
- Ensure that the computer is turned off
- Unplug/disconnect all USB connections
- Unplug the ac adapter cable
- Carefully remove the battery
- Press and hold down on the power button for at least 10 seconds
- Connect the ac adapter without the battery
- Turn on the computer
If the above procedure works,then you may reconnect all devices once the computer is up and running. Otherwise, I am recommending a full operating system re install.
I hope this helps, Thanks for using Fixya.