Blank nav screen

[beekahx4]

Hi all I have a 01 4.4 with a mk3 with 4:3 monitor. My radio/cdplayer/tape cassette all work but my screen doens't work anymore. I am not able to navigate through the menu anymore b/c of this and my time is stuck at an hour behind on the dashboard. I don't know if this caused it but soon after I left the head lights on one night many moons ago. I noticed that my Nav screen would start to flicker in and out. The edges would start to get dim until the whole screen would eventually turn black.

Now what are my options here? Should I go try and buy a new 16:3 monitor and see if that will fix the problem? Should I goto the dealership and pay an exorbanant amount to fix it? Am I able to get an aftermarket monitor installed?
Thanks in advance to all who can help this poor fellow out.