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7-6 www.hp.com Technical Reference Guide
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:
NOTE:
[1] Will be accompanied by the same number of beeps, with 2-second pause between cycles. Beeps
stop after 5 cycles.
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.