HP dc7800 manual Power Button Actions Power LED Condition, Dimm

Power and Signal Distribution

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

	Table 7-5.
	Power Button Actions
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.
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.

Technical Reference Guide www.hp.com 7-7