IBM ThinkPad X20 Hardware Maintenance Manual page 34

If the computer cannot be powered on, go to "Power
system checkout" on page 32 and check the power
sources.
If an error code appears, go to "Symptom-to-FRU
index" on page 44.
On the first screen, select the model and press Enter.
Follow the instructions on the screen.
2. The main panel of PC-Doctor appears.
3. Select Diagnostics with 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
v Run Normal Test
v Run Quick Test
v CPU/Coprocessor
v Systemboard
v Video Adapter
v Serial Ports
v Parallel Ports
v Fixed Disks
v Diskette Drives
v Other Devices
v ZIP Drive
v LS-120/240 Drive
v Wireless LAN
v Memory Test-Full
v Memory Test-Quick
Notes:
v In the Keyboard test in Interactive tests, the Fn key is
scanned only once. Because of this, each key should be held
down for at least 2 seconds or it will not be sensed.
v The sound card is not recognized in the Stereo Speaker in the
Interactive Tests. To test it, use the audio device test in the
Other Devices (Diagnostics).
v Video Adapter test supports only the LCD display on
ThinkPad. Before running PC-Doctor DOS, detach the external
Monitor.
v To test ZIP Drive or LS-120 Drive, each media is needed to be
inserted before start testing.
v Wireless LAN test is only for some models. Some model do
not have them.
v To test Digital Signature Chip, the chip must be enabled and
initialized.
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ThinkPad X20, X21, X22
Interactive Tests
v Keyboard
v Video
v Internal Speaker
v Mouse
v Joystick Test
v Diskette
v System Load
v CD-ROM/DVD Test
v Stereo Speaker
v 802.11 Wireless Radio Test