HI there everyone

I have inherited my mothers five hundred SEL 162K. the car runs really really great.
took it to Myrtle Beach SC 2 weeks ago and No problems at all, come home and let it sit for about a week. come out to start it up and starts right up.
the issue is my instrument cluster is dead, backup lights are always on, I checked for any loose connections and bad fuses put all the fuses are good.
Any help received would be most helpful, thanks in advanced.

Usmarine0905

 

My mom has a 2005 Ford Five Hundred 40k miles And the back up lights were on when in park or driving. And the dash lights did not come on. They replaced the battery and alternator. And a week later the car won’t start now. It has been connected to the computer 3 times and shows no codes.