[Sailrace]

After pulling the battery and putting it back in, try hard reset:

Hold down the Enter button (center button on 4 way) and the VolumeDown button. While holding these, press and hold the Power button on the top of the device.

Hold all three down for about 5 to 10 seconds, and if it works, you'll get a grey screen that asks if you want to restore to factory, press VolumeUp. Proceed from there.

If that doesn't happen / work, you may be in trouble.