Mercedes Benz E320 Car Starting Issues

Question

Hello,

My father has been working on our 2005 Mercedes Benz E320 Sedan.  Initially, there was an issue with the headlight, so he replaced the fuse box, and the lights began working.  However, the car, which was running just fine, did not start.  

He replaced the new fuse box with the old, and the car still does not start.  The dashboard in the middle of the speedometer reads in Red: "BRAKE / Reduced Braking Power/Start Engine".  I have a picture of it, and have attached it to the image section below.

May someone please assist us with this issue?  Your assistance is truly appreciated.

Thank you,

Art Armendariz