I have a dell 20" widescreen attached to a mac mini. I noticed while rebooting today that the airport icon in the menu bar along with adium and quicksilver (all the icons that don't change or animate) were showing a slight trace of burn on the blue and gray background when rebooting. the menu icons like ram usage, cpu meter and net traffic (all the ones that change what they show) were not leaving a trace. this is evidence of burning no?

its an lcd connected via dvi and should not be doing this. besides, even if lcd's could burn my display is set to go to sleep after 10 min.

I don't understand.. why is happening? is there anything I can do?
Mac mini C2D 1.83GHz - 2GB RAM - 200GB 7200rpm HD
Sawtooth w/G4 1GHz - 1GB RAM - SIIG SATA w/2x1TB HD
B&W w/G4 600MHz - 1GB RAM - 2x80GB HD
Sawtooth G4 400MHz - 512MB RAM - 40GB HD
Dell Ultrasharp 2007WFP 20" Widescreen LCD
2.94TB Total Storage