ipad a1673

My ipad pro A1673 is about four years old. While I was watching a Youtube, the screen suddenly went out. Even though there is no screen I was able to sign in and backup to itunes. I bought a new screen, but all the new screen does is light up. Any idea what is wrong?

Trying to restore my iPad pro model A1673 to original factory settings because I forgot passcode. My attempt at restoring has failed three times now after I carefully followed directions (support.apple.com/en-us/HT204306) each time. This last time I have documented the steps by writing down...