Normally your Macintosh beeps to attract your attention. If you have difficulty hearing (or are using your Macintosh in a noisy environment), you might prefer replacing a beeping noise with a flashing screen.
To make your Macintosh flash the screen instead of beeping to get your attention, do the following:
Click the Apple menu and choose System Preferences. A System Preferences window appears.
Click the Universal Access icon under the System category. A Universal Access window appears (see Figure 18-3).
Click the Hearing tab, as shown in Figure 18-4.
Select (or clear) the Flash the screen when an alert sound occurs checkbox.
(Optional) Click the Flash Screen button to see how the screen flashes.
Click the close button of the Universal Access window.
