I'm no expert, but what I did following someone's posted directions, worked for me.
Make sure that the phone has battery.
Follow the hard recovery, three button technique.
Does it enter a recovery mode?
If so, continue. If not, idk.
To Try to recover
Use the up and down volume key to scroll.
Use the home / back button to enter
I first did option one, and it did not fix the problem
Second I did option 3, and the phone recovered.