Clearing Cmos - Compaq 133756-004 - Deskpro EN - 6550 Model 6400 Maintenance & Service Manual

5.1.3

Clearing CMOS

The computer's configuration (CMOS) may occasionally be corrupted. If it does, it is
necessary to clear the CMOS memory using switch SW50.
To clear and reset the configuration, perform the following procedure:
1. Prepare the computer for disassembly (Section 4.2).
CAUTION: The power cord must be disconnected from the power source before changing the
jumpers. All LEDs on the system board should be off. Failure to do so may damage the system
board.
2. Remove the computer cover (Section 4.6).
3. Press the CMOS button located on the system board and keep it depressed for
5 seconds.
4. Replace the computer cover.
5. Turn the computer on.
6. Run the Computer Setup utility to reconfigure the system.
When the jumper is removed, both the power-on password and the setup password
become invalid because both are stored in the configuration memory. You will need to
reset the passwords.
Compaq Deskpro EN Series of Personal Computers 5-3