Canon A550 - Manual (Page 79)

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When the power is turned on
“Card locked!” message appears.
The SD memory card or
SDHC memory card’s
write protect tab is set to
“Write protect”. z When recording to, erasing from or
formatting the memory card, slide
the write protect tab upward
(p. 93).
The Date/Time menu appears.
The lithium coin battery
charge is low. z Replace the lithium date battery
(p. 101).
LCD monitor
Nothing displays.
The LCD monitor is set
not to display. z Press the DISP. button to turn on
the LCD monitor (p. 12).
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 images, 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 recorded in movies, but
not in still images).