IBM Thinkpad X20 X21 X22 X23 X24 Manual

vUser HDP - for the user
vMaster HDP - for the system administrator, who can use
it to get access to the hard disk even if the user has
changed the user HDP
Note:There are two modes for the HDP: User only and
Master + User. The Master + Usermode requires
two HDPs and is designed for the system
administrator to input both in the same operation.
The system administrator then provides the user
HDP to the system user.
Attention:
If the user HDP is forgotten, check to see if a master HDP
was set. If a master...

(B) If SVP is not installed
1. Turn off the computer.
2. Remove the DIMM cover from the bottom of the
computer.
3. Remove the backup battery. For information on how to
remove the backup battery, see“1030 Backup battery”
on page 60
4. Turn on the computer and wait until the POST ends.
After the POST ends, the password prompt does not
appear. The POP has been removed.
5. Reinstall the backup battery and the DIMM cover.
How to remove the hard-disk password:
Attention:
IfUser onlymode is selected and the...

Note:Screen blank mode in Windows 98 is called standby
mode in Windows 95.
To enter screen blank mode, pressFn+F3. To end screen
blank mode and resume normal operation, press any key.
Standby mode:When the computer enters standby mode,
the following events occur in addition to what occurs in
screen blank mode:
vThe LCD is powered off.
vThe hard disk drive is powered off.
vThe CPU stops.
Note:Screen blank mode in Windows 98 and Windows
2000 is called standby mode in Windows 95.
To enter standby mode, do...

vThe resume timer is set. In Windows 98, theScheduled
Taskssetting has priority over theResume on timer
selection in the“Power Management Properties”
window.
Note:The computer does not accept any input
immediately after it enters suspend mode. Wait a
few seconds before taking any action to reenter
operation mode.
Hibernation mode
Note for Windows NTA Windows NT user cannot create a hibernation file
in a Windows NT system that uses NTFS format,
the Windows NT default format. If you want to use
hibernation...

vA critically low battery condition occurs and the mode is
set toHibernate when battery becomes low.
When the power is turned on, the computer leaves
hibernation mode and resumes operation. The hibernation
file in the boot record on the hard disk drive is read, and
system status is restored from the hard disk drive.
Chapter 2. General descriptions
31 

Checkout guide
Use the following procedures as a guide in identifying and
correcting problems with the ThinkPad computer.
Note:The diagnostic tests are intended to test only IBM
products. The use of non-IBM products, prototype
cards, or modified options can lead to false
indications of errors and invalid system responses.
1. Identify the failing symptoms in as much detail as
possible.
2. Verify the symptoms. Try to re-create the failure by
running the diagnostic test or by repeating the
operation....

If the computer cannot be powered on, go to“Power
system checkout”on page 35 and check the power
sources.
If an error code appears, go to“Symptom-to-FRU
index”on page 48.
On the first screen, select the model and pressEnter.
Follow the instructions on the screen.
2. The main panel of PC-Doctor appears.
3. SelectDiagnosticswith the arrow keys, and press
Enter.
A pull-down menu appears. (Its exact form depends on
the model.)
The options on the test menu are as follows:
Diagnostics Interactive Tests
vRun...

Notes:
vIn theKeyboardtest inInteractive tests, theFnkey is
scanned only once. Because of this, each key should be held
down for at least 2 seconds or it will not be sensed.
vThe sound card is not recognized in theStereo Speakerin the
Interactive Tests. To test it, use the audio device test in the
Other Devices (Diagnostics).
vVideo Adaptertest supports only the LCD display on
ThinkPad. Before running PC-Doctor DOS, detach the external
Monitor.
vTo testZIP DriveorLS-120 Drive, each media is needed to be...

Detecting system information with
PC-Doctor
PC-Doctor can detect the following system information:
Hardware Info:
vSystem Configuration
vMemory Contents
vPhysical Disk Drives
vLogical Disk Drives
vVGA Information
vIDE Drive Info
vPCI Information
vPNPISA Info
vSMBIOS Info
vVESA LCD Info
Utility:
vRun External Tests
vSurface Scan Hard Disk
vBenchmark System
vDOS Shell
vTech Support Form
vBattery Rundown
vView Test Log
vPrint Log
vSave Log
vFull Erase Hard Drive
vQuick Erase Hard Drive
Power system...

v″Checking the AC adapter″36
v″Checking operational charging″36
v″Checking the battery pack″37
v″Checking the backup battery″37
Checking the AC adapter:If the computer fails only when
the AC adapter is used, check the following:
vIf the power problem occurs only when the port
replicator is used, replace the port replicator.
vIf the power-on indicator does not turn on, check the
power cord of the AC adapter for correct continuity and
installation.
vIf the computer does not charge during operation, go to...