IBM IntelliStation M Pro 6218, Problem Determination And Service Manual

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Erasing a lost or forgotten password (clearing CMOS)
If the power-on or administrator password is lost or forgotten, you can regain
access to the computer through one of the following methods:
v
If you have forgotten the power-on password and an administrator password is
set, type the administrator password at the power-on prompt; then, start the
Configuration/Setup Utility program and change the power-on password (see the
User’s Guide on the IBM IntelliStation Documentation CD for more information).
v
Remove the battery and then reinstall the battery (see “Removing the battery” on
page 92 and “Installing the battery” on page 93).
v Clear CMOS settings by changing the position of the CMOS recovery jumper
(JP1).
To set the CMOS recovery jumper and erase a forgotten password, complete the
following steps:
1. Read the safety information that begins on page vii and “Handling
static-sensitive devices” on page 74.
2. Turn off the computer and all attached devices.
3. Disconnect the power cord.
4. Remove the cover and hard disk drive bracket (if one is installed).
5. Locate the CMOS recovery jumper (JBAT1) on the system board (see Figure 8
on page 55), removing any adapters that impede access to the jumper.
6. Move the CMOS recovery jumper from pins 1 and 2 to pins 2 and 3.
7. Wait 60 seconds; then, return the CMOS recovery jumper to pins 1 and 2.
8. Replace any adapters that were removed; then, replace the hard disk drive
bracket (if one was removed) and the cover.
9. Connect the computer to a power source, keyboard, monitor, and mouse.
Note: You can now start the computer one time and start the
Configuration/Setup Utility program without having to use the power-on
password. At this time, you can either delete the old power-on password or set
a new power-on password. If you do not change or delete the password, the
next time you start the computer the original power-on password will be
reinstated.
10. Turn on the computer and start the Configuration/Setup Utility program.
11. Follow the instructions to erase the existing password or to create a new
password.
12. Click Save Settings and exit the Configuration/Setup Utility program.
Solving power problems
Power problems can be difficult to solve. For example, a short circuit can exist
anywhere on any of the power-distribution buses. Usually, a short circuit will cause
the power subsystem to shut down because of an overcurrent condition. To
diagnose a power problem, use the following general procedure:
1. Turn off the computer, and disconnect all ac power cords.
2. Check for loose cables in the power subsystem. Also check for short circuits, for
example, if there is a loose screw causing a short circuit on a circuit board.
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IBM IntelliStation M Pro Type 6218 and 9236: Problem Determination and Service Guide