HP 742n - Pavilion - 512 MB RAM White Paper - Page 8

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HP 742n - Pavilion - 512 MB RAM White Paper
There is no way of telling if the PC is in Hibernate mode.
The best way to ensure that the PC is not in Hibernate
mode is to restart the PC then shut it down. To do this,
select Shut Down from the Start menu then under the
heading µWhat do you want the computer to
do?¶ select the option ' Shut Down¶ from the drop-
down list.
If the Shut Down Option Has Been
Removed
If the 'Shut Down' has been removed from the list of
options, the following procedure is recommended to
ensure the PC is not serviced while in S4 mode.
Procedure:
1 Restart the PC by selecting Start>Shut Down and then
choosing 'Restart' from the drop-down menu.
2 When the PC has fully shut down and is just beginning
to restart (you will see the initial Brio, Vectra, Kayak or
HP logo), press the power switch to shut down the PC.
3 Remove the power cable to isolate the PC.
Alternatively, you can log on to the PC as Administrator
and then activate the Shut Down option in
Start>Settings>Control Panel>Power Options. . . . The choice
'Shut Down' will then be available in the dropdown
menu headed 'What do you want the computer
to do?' . Use this to choice to shut down the computer
and then remove the power cable.
Once servicing or upgrading has been completed, the PC
will perform the full startup procedure, taking into account
any changes to the PCs configuration.
Note that if the PC is serviced (power off) while in the
Hibernate mode, the power up sequence may easily
cause an OS crash with unpredictable and undesirable
effects.
This is particularly the case when the hardware
configuration has been altered in the serviced PC.
Hibernate will assume there has been no power
interruption and will attempt to reload the previous OS
state from the hard disk without verifying the state of any
hardware present (which may require initialization after a
power out).
The full boot from S5 checks all hardware and carries out
all initialization required.
Power Loss in the Different Power
Management States
If the PC looses power in S1 or S3 Standby mode
(through a power failure in the building or by pulling out
the PC's power cord), you will loose any unsaved data. In
this case it is just as if the PC lost power while it was on.
If the PC looses power in Hibernate (S4) or soft off (S5)
mode however, there will be no data loss. In fact, it is as
if the PC was already powered off.
RPO 'out of the box'
New HP PC are delivered preloaded and ready to
function 'out of the box' as soon as they are powered up.
However, the Remote Power On (RPO) function requires
a continued power supply to operate correctly. When
your HP PC comes 'out of the box' it is in a state
equivalent to a power interruption.
To set up RPO, you should connect up all peripherals
and switch on the PC. Enable the Hibernate option then
put the PC into Hibernation mode by selecting
Start>Shutdown>Hibernation. The computer is now
able to respond to any RPO request.
From the box:
1 Connect all PC peripherals and power cable
2 Press the Power Switch to power-up the PC
3 After the OS is running, enable Hibernate in
Start>Settings>Control Panel>Power Options.
4 Put the computer into the Hibernate mode by selecting
Start>Shut Down>Hibernate.
Alternatively, If your PC fully supports RPO from S5 and
you have enabled the option in the BIOS, you can put
the PC into Hibernate mode simply by pressing the
Power Switch a second time.
The PC is now in Hibernate mode and 'set' for RPO.
Note: it is possible that at the next use of the PC
following this initialization a glitch will be noticed (once
only) when the PC restarts. This is normal, and is dealt
with by the PC during the course of the restart. Your HP
PC is now operative.

For More Information

The ACPI web site
•
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The ACPI Specification
•
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Microsoft's web site on power management, ACPI,
•
APM, and Windows operating systems
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Microsoft's hardware white paper "Windows Power
•
Management Configuration Tools Design Notes and
Reference" is available at
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Intel's web site on 'Instantly Available' and ACPI
•
technology
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HP's white paper "HP Windows 2000" discusses the
•
support offered for Windows 2000 (including its
power management features) on HP Desktop PCs.
It is available at
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.