Sony KP-43HT20: Can't Read On-Screen Menu! Need Help

Isn't there anyone around here who's seen this before???  I have a Sony KP-43HT20 rear projection TV with the RA-6 chassis.  The on-screen menu has become unreadable.  The normally green characters on the video, audio, channel, parental and timer menus are dark and barely visible.  Any ideas how to tackle this problem?  Thanks.