You can try resetting it by unplugging the battery for a few minutes. I suspect that won't do much. Looks like the display got damaged somehow. If that doesn't work:
Options:
1) dealer: nope, they will want to replace it ($$$$). Do you have a warranty??
2) repair it: could/most likely costly. Just the display is shot.
3) Browse ebay. I thought I saw someone buy one cheap (less than $100) not too long ago.
Good luck