Personal Computer Maintenance & Service Guide

5-6 Connectors, Jumpers, and Switches
Disabling or Clearing the Power-On and Setup Passwords (440BX) )
1. Turn off the computer and any external devices, and disconnect the power cord from
the power outlet.
2. Set SW1, position 1, to the ON position.
3. Turn on the computer and allow the operating system to start. This clears the current
passwords and disables the password features.
4. To re-enable the password features, turn off the computer and set SW1, position 1, to
the OFF position.
5. Turn on the computer and establish new passwords.
Clearing Configuration Memory (CMOS) (440BX)
The computer’s configuration memory (CMOS) may occasionally be corrupted. When
this occurs, it is usually due to software or hardware that is not functioning accurately or
due to the addition or removal of expansion boards. If the computer’s configuration
memory becomes corrupted, it is necessary to clear the configuration memory.
1. Turn off the computer and any external devices, and disconnect the power cord from
the power outlet.
2. Disconnect the keyboard, monitor, and any other external equipment connected to the
computer.
3. Remove the computer access panel.
4. Locate jumper E50.
5. Remove the jumper from pins 1 and 2, place it on pins 2 and 3 for approximately 30
seconds, then return it to pins 1 and 2.
6. Replace the computer access panel.
7. Reconnect the external equipment.
8. Plug in the computer and turn on power.
When the CMOS jumper is removed, all passwords become invalid because the passwords
are stored in the configuration memory. You must reset the passwords and any special
system setups.
Another method of clearing CMOS is to use the F10 Setup feature.