Charged after putting in a new battery but screen remains gray

My Kindle Keyboard wouldn’t charge after a couple of years of not using it. I ordered and installed a new battery. It charged up just fine with the amber light turning to green after a couple of hours. I took off the charger, slid/released the on button and nothing. Tried all the holding of the slide bar (the green light comes on, blinks, then goes off), tried the Alt/r, Alt/shift/r, soft drop on the carpet, but nothing has helped. Although the screen is gray I can see the tree in the background and what looks like the reboot/download? bar that looks like it is about 1/3 filled. Any suggestions? I saw one guy who opened his up and “shorted” some terminals but holding off on that for now!