Intel BOXDX79TO Product Specification - Page 36
Power Supervisor, 12.2.11, 5 V Standby Power Indicator LED - atx
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Intel Desktop Board DX79TO Technical Product Specification 1.12.2.10 Power Supervisor The Power Supervisor actively monitors the input voltages from the power supply and protects the board and any attached peripherals from electrical overstress and possible physical damage. The Power Supervisor will activate if it detects the power supply voltage rails have deviated outside the current ATX power supply specification and safe operating levels. If the Power Supervisor detects an out of spec voltage, the following will happen: 1. The board will be powered down immediately to protect circuits from electrical overstress and possible physical damage. 2. A red warning LED on the board will activate as a visual cue. 3. During the next power on, a message will be displayed on the screen to notify the user that the power supply voltage rails have deviated outside the current ATX power supply specification and safe operating levels. 4. A message will be added to the BIOS Event Log for each event that takes place until the BIOS Event Log is cleared. 1.12.2.11 +5 V Standby Power Indicator LED The +5 V standby power indicator LED shows that power is still present even when the computer appears to be off. 36