Thermal Sensor; Dual-State Power Button - HP xw4550 Service And Technical Reference Manual

memory errors. The Prefailure Warranty for ECC memory modules enables you to replace these
modules, free of charge, before the modules actually fail. ECC memory modules are optional on selected
HP workstations.

Thermal sensor

There are multiple sensors on your workstation:
●
One for the processor
●
One for the system board
●
Some hard drives
The processor thermal sensor monitors the processor core temperature, while the board thermal sensor
monitors the internal temperature of the workstation. These sensors control the speed of the workstation
cooling fans as the processor and internal workstation temperatures increase and decrease.
The cooling system is designed to provide maximum thermal dissipation for a fully configured
workstation, which ensures that the processor and all system components do not exceed safe operating
temperatures. If the maximum force of the cooling fans cannot adequately cool the processor, the
processor clock automatically begins to slow. If the temperature remains above limits even with reduced
processor clock speed, the system eventually shuts down.

Dual-State Power Button

With ACPI enabled, the power button can function either as an on/off switch or as a button. The feature
does not completely turn off power, but instead causes the workstation to enter a low-power standby
state. This allows you to power down without closing applications and to return to the same operational
state without any data loss.
To change the power button configuration:
1. Select Start, and select Control Panel>Power Options.
2. In Power Options Properties, select the Advanced tab.
3. In the Power Button section, select Hibernate. (Hibernate must be enabled in the Hibernate
tab.)
After configuring the power button to function as a button, press the power button to put the system in
a very low power state. Press the button again to bring the system out of the very low power state to full
power status. To completely turn off all power to the system, press and hold the power button for four
seconds.
CAUTION:
responding; turning off the power without operating system interaction could cause damage to or loss
of data on the hard drive.
48 Chapter 3 System management
Do not use the power button to power off the workstation unless the system is not
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