Compaq dc5850 - Microtower PC Technical Reference Manual page 79

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:
Power LED
Steady green
Blinks green @ 0.5 Hz
Blinks red 2 times @ 1 Hz [1]
Blinks red 3 times @ 1 Hz [1]
nks red 4 times @ 1 Hz [1]
Bli
Blinks red 5 times @ 1 Hz [1]
Blinks red 6 times @ 1 Hz [1]
Blinks red 7 times @ 1 Hz [1]
Blinks red 8 times @ 1 Hz [1]
Blinks red 9 times @ 1 Hz [1]
Blinks red 10 times @ 1 Hz [1]
No light
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
Table 7-4.
Power LED Indications
Condition
Normal full-on operation
Suspend state (S1) or suspend to RAM (S3)
Processor thermal shut down. Check air flow, fan
operation, and CPU heat sink.
Processor not installed. Install or reseat CPU.
Power failure (power supply is overloaded). Check storage
devices, expansion cards and/or system board (CPU
power connector P3).
Pre-video memory error. Incompatible or incorrectly seated
DIMM.
Pre-video graphics error. On system with integrated
graphics, check/replace system board. On system with
graphics card, check/replace graphics card.
PCA failure. Check/replace system board.
Invalid ROM (checksum error). Reflash ROM using CD or
replace system board.
System powers on but fails to boot. Check power supply,
CPU, system board.
Bad option card.
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.
www.hp.com
Power and Signal Distribution
7-5