12.4 – Screen colors – the background color can be set to either the default
blue color or an optional gray in the System Setup menu.
12.4.1 – Touch the Setup software key and Setup Access menu appears.
12.4.2 - Enter the password, if required, after touching the Locked key and
then the DONE key. Otherwise if not locked touch the System Setup key and
the System Setup menu displays.
12.4.3 – Touch the Screen colors key and the background color will alternate
between the blue and gray colors.
12.4.4 – Touch the Done key when finished to save and exit to the main menu.
Utilities – “Screen Colors”