5. Disconnect any external devices that you do not want to test. (Do not
disconnect the printer if you want to test it or use it to log error
messages.)
NOTE: If a problem only occurs when an external device is connected to
the computer, the problem may be with the external device or its
cable. Verify this by running POST with and without the external
device connected.
6. Install loopback plugs in the serial and parallel connectors if you
would like to test these ports (Table 3-13).
7. Ensure that the removable hard drive is installed in the computer.
8. Ensure that the battery pack is inserted in the computer and the
computer is connected to an external AC power source.
When the preliminary steps are complete, you are ready to run POST
(Section 2.2) and Computer Checkup (Section 2.3).
Clearing the Power-on Password
Clearing the power-on password clears CMOS, the EEPROM that contains
configuration information for all external devices, the setup password, and
all other security features including:
o QuickLock
o QuickBlank
o Diskette drive disable
o Diskette boot ability disable
o Serial port disable
o Parallel port disable
o PCMCIA slot disable
NOTE: Disconnecting the auxiliary battery does not clear the power-on
password.
If the password is unknown, clear it by completing the following steps:
1. Turn off the computer.
2. Disconnect the power cord.
3. Remove the battery pack (Section 4.5).
4. Remove the keyboard cover (Section 4.7).
5. Remove the keyboard, but don't disconnect the cable (Section 4.10).
Place the keyboard toward the front of the system unit to access the
jumper located near the lower-right corner of the processor board.
NOTE: The pins used by the jumper are labeled on the system board as
"1," "2," and "3." (Pin "1" is toward the rear of the computer.)
The jumper can be placed simultaneously on pins 1 and 2 (the
"1-2" or "normal" position [1]) or on pins 2 and 3 (the "2-3" or
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