Screen Flash Behavior
Solution 1:
Do you have your system sound muted or volume turned all the way down? Even for the non-hearing-impaired the Mac will use visual bells (at least some of the time) when sound output is turned off.
Do you have your system sound muted or volume turned all the way down? Even for the non-hearing-impaired the Mac will use visual bells (at least some of the time) when sound output is turned off.