When you run it it turns the screen dark and puts some gibberish on the bottom and right. You can (clear) it but it still remains dark. If you turn it off then on the cursor is on the bottom right and it writes everything upside down. It's basically like someone took out the screen and turned it 180 deg. The only way to fix this it to remove a battery while it is off.IIRC certain TI-84 Plus models have a hardware feature that does that (flips the screen). It's not common at all and nobody (AFAIK) uses it in their programs, so it must be some sort of weird bug (not sure where from). I doubt it's your Axe program though. Nobody's ever heard of that showing up in Axe.