[Test-Equipment] question on display on R2400A Motorola service Monitor

[JEFFREY MICHAEL KENYON]

Hi everyone.  There is something that I ma doing to this R2400A Service
Monitor that is some how turning off the display.  It doesn't matter to me
as to whetheoror not it is turned on, because I can't see it that well,
butwant to show this unit to friends here, and my step dad keeps telling
me taht the display os off.  What do I need to do to turn it back on?  Any
help would be appreciated, and thanks in advance.