Marantz SR6006 - Marantz title banner is stuck

My spouse turned on the TV tonight and somehow got a black rectangle (with the word Marantz in it) that blocks the upper left corner of the TV screen. I have played with the remote but I have discovered no way to remove it. I paged through the manual but I don't even know how to describe the problem in a way to look up its solution. Any ideas?
try unplugging it from the wall to reboot the computer in your TV turning it off with the remote doesn't  actually turn it off.