LG V500 Guide De L'utilisateur page 560

Message
Files do not
open
No sound
Hangs up
or freezes
104
Possible causes
Unsupported file
format
Vibration mode
Intermittent software
problem
Possible corrective measures
Check the supported file formats.
Check the settings status in
the sound menu to make sure
you are not in vibration or silent
mode.
Try to perform a software update
via the website.