Canon A420 - Manual (Page 76)

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When the power is turned on
"Card locked!" message appears.
The SD memory card's
write protect tab is set to
"Write protect". z When recording to, erasing from or
formatting the memory card, slide
the tab upward
(p. 87) .
The Date/Time menu appears.
The lithium coin battery
charge is low. z Replace it (p. 89) .
LCD monitor
The display darkens.
The image in the LCD
monitor will darken in
strong sunlight or bright
light. z This is a normal occurrence in
devices containing CCDs and does
not constitute a malfunction. (This
image will not be recorded when
shooting still photos, but it will be
recorded when shooting movies.)
Display flickers.
Display flickers when
shot under fluorescent
lighting. z This is not a camera malfunction.
(Flickering is recorded in movies, but
not in still images.)
A bar of light (red, purple) appears on the LCD monitor.
Subject is too bright. z This is a normal occurrence in
devices containing CCDs and does
not constitute a malfunction. This
bar of light will not be recorded when
shooting still photos, but it will be
recorded when shooting movies.
appears.
A slow shutter speed has
likely been selected
because of insufficient
lighting. z Raise the ISO speed, set the flash to
anything other than (Flash off),
or affix the camera to a tripod to
shoot (Basic Guide p. 8).