All was working well after my initial download earlier today. I reconnected to install the additional fonts and themes, and now I have an image of what appears to be a silver cylinder with a yellow projectile in the center of the screen, distorted images of the battery life indicator and clock at the top of the screen, and a jumble of indistinct images at the bottom. The unit will not power off. I have turned the hold switch on and held the REC button. All too no avail. Any suggestions?