The Display Manager's title bar contains a flashing red alarm signal that indicates that an alarm condition has been triggered. In addition to the alarm signal, a siren sounds to alert you.

When you see the flashing red alarm signal and hear the alarm siren, an alarm has been triggered. You should respond immediately by navigating to the Alarm page. To switch to the Alarm page, simply click the Alarm button in the Display Manager's title bar's flashing area. The Alarm page opens, allowing you to respond to the alarm (see Responding to Alarms).