HP MAY21J8412 Table, Power LED, Condition, Power LED Indications

Power and Signal Distribution

A dual-color LED located on the front panel (bezel) is used to indicate system power status. The front panel power LED provides a visual indication of key system conditions listed as follows:

	Table 7-5.
	Power LED Indications
Power LED	Condition
Steady green	Normal full-on operation
Blinks green @ 0.5 Hz	Suspend state (S1) or suspend to RAM (S3)
Blinks red 2 times @ 1 Hz [1]	Processor thermal shut down. Check air flow, fan operation, and CPU
	heat sink.
Blinks red 3 times @ 1 Hz [1]	Processor not installed. Install or reseat CPU.
Blinks red 4 times @ 1 Hz [1]	Power failure (power supply is overloaded). Check storage devices,
	expansion cards and/or system board (CPU power connector P3).
Blinks red 5 times @ 1 Hz [1]	Pre-video memory error. Incompatible or incorrectly seated DIMM.
Blinks red 6 times @ 1 Hz [1]	Pre-video graphics error. On system with integrated graphics,
	check/replace system board. On system with graphics card,
	check/replace graphics card.
Blinks red 7 times @ 1 Hz [1]	PCA failure. Check/replace system board.
Blinks red 8 times @ 1 Hz [1]	Invalid ROM (checksum error). Reflash ROM using CD or replace
	system board.
Blinks red 9 times @ 1 Hz [1]	System powers on but fails to boot. Check power supply, CPU, system
	board.
Blinks red 10 times @ 1 Hz [1]	Bad option card.
Blinks red 11 times @ 1 Hz [1]	Processor does not support previously enabled feature.
No light	System dead. Press and hold power button for less than 4 seconds. If
	HD LED turns green then check voltage select switch setting or
	expansion cards. If no LED light then check power button/power supply
	cables to system board or system board.

NOTE:

[1]Will be accompanied by the same number of beeps, with 2-second pause between cycles. Beeps stop after 5 cycles.

7-6 www.hp.com Technical Reference Guide