Gigabyte GA-P55A-UD7 Manual - Page 24
Onboard LEDs and Buttons
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1-10 Onboard LEDs and Buttons CPU VTT/Memory Phase Indicator LEDs This motherboard contains 4 phase indicator LEDs controlled by the system BIOS to indicate the phase status of the CPU VTT and memory. The green LEDs light up under normal working conditions; the yellow LEDs will be illuminated during an overvoltage or heavy loading state. M_P_LED (Memory): MD1: Normal working conditions (green LED) MD2: Overvoltage or heavy loading (yellow LED) V_P_LED (CPU VTT): GD1: Normal working conditions (green LED) GD2: Excessive overvoltage or heavy loading (yellow LED) ACPI LEDs The 4 embedded ACPI LEDs indicate the system power status (S0, S1, S3, S4, S5) to prevent potential hardware damage due to improper plug/unplug actions. ACPI LEDs: S4_S5_LED S3_LED S1_LED S0_LED Hardware Installation - 24 -