Temperature Sensing; Table 4-16. System Operational - HP Deskpro EX Technical Reference Manual

Chapter 4 System Support
Table 4-16 lists the operation status codes provided by the power LED on the front of the chassis.
Note that error or problem conditions are reported only by the power LED on the minitower.
Table 4-16. System Operational Status LED Indications
System Status
S0: System on (normal operation)
S1: Suspend
S3: Suspend to RAM
S4: Suspend to disk
S5: Soft off
Processor not seated
CPU thermal shutdown
ROM error
Power supply crowbar activated
System off

4.7.4 TEMPERATURE SENSING

The microprocessor features an internal temperature sensor that will detect an excessive heat
condition and initiate a CPU shut-down routine. On minitower systems a Thermal Trip signal
routed to the I/O controller is asserted, resulting in the I/O controller's LED logic to blink the front
panel Power-On LED red at approximately four times a second.
4-36 Compaq Deskpro EX Series of Personal Computers
Table 4-16.
System Operational Status LED Indications
Power LED
Steady green
Blinks green @ 1 Hz
Blinks green @ 1 Hz
Blinks green @ 0.5 Hz
Off - clear
Off - clear
Off - clear
Off - clear
Off - clear
Off - clear
First Edition - August 2000
Desktop Minitower
Power LED
Steady green
Blinks green @ 1 Hz
Blinks green @ 1 Hz
Blinks green @ 0.5 Hz
Off - clear
Steady red
Blinks red @ 4 Hz
Blinks red @ 1 Hz
Blinks red @ .5 Hz
Off