Last night my dog ran over the keyboard of my Dell Inspiron N411z .  The screen now displays upside down.  I can fix it manually by using the Fn key and the F1 key which brings up some screen options, but I'd like to permanently fix this.   Oddly enough my dog did this to my other laptop a few years back.  I'm not sure what he's running across to do this.  

Any suggestions on how to fix this so the screen isn't upside down every time I start the computer?

Thanks!