Check the box next to “Flash the screen when an alert occurs”Ĭlick the “Test screen flash” button to test it and see exactly what it looks like on your Mac.Under the Hearing menu on the left, choose “Audio”.Open System Preferences via the Apple menu and go to “Accessibility”.This enables an obvious visual screen flashing cue in addition to the system alert sound in Mac OS X, it works in all modern versions of system software:
How to Turn On Screen Flashing for Alerts in Mac OS X It’s really better observed directly than explained, and you can easily test out the screen flash before enabling it fulltime to see if you like it or not for your individual needs. The screen flash isn’t overly dramatic but it is obvious, and it looks sort of like a transparent light grey flicker that flashes brightly over everything on screen for a few milliseconds. The screen flash alert is silent but offers unmistakable feedback that an alert has occurred, and can be used in conjunction with the standard alert sounds too. A little-known screen flashing feature exists in Mac OS X that provides an alternative way of being notified of system alerts, meaning that anytime you’d typically hear the general system sound effect feedback, see a bouncing Dock icon, or have a new icon badge appear, the screen will briefly flash instead.
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