Canon A720 1S User Manual page 157

Playback
Cannot play back.
You attempted to play back
images shot with another
camera or images edited
with a computer.
File name was changed with
a computer or file location
was changed.
Movies do not play back correctly.
Movies recorded with high recording pixels may momentarily stop
playing if played on slow reading memory cards.
You may experience frame dropping and audio breakup when
playing back a movie on a computer with insufficient system
resources.
Reading images from memory card is slow.
Memory card was formatted
in another device.
Computer images that cannot be
played back may play back if they are
added to the camera using the
supplied software program
ZoomBrowser EX or ImageBrowser.
See ZoomBrowser EX/
ImageBrowser Software User Guide
(PDF).
Set the file name or location on the
file format/structure of the camera.
(Refer to the Software Starter Guide
for details).
Use a memory card formatted in your
camera (p. 56).
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Troubleshooting