Compaq 486 Maintenance And Service Manual page 8

5. Access the fixed disk drive.
You will know that the fixed disk drive password is set when the
DriveLock icon (see illustration of DriveLock icon below) appears on the
screen. If this occurs, you must enter the fixed disk drive password to
continue.
IMPORTANT: It is not necessary to access the fixed disk drive in order to run
the Diagnostics diskette; however, complete system testing cannot be done
without access to the complete system.
The user must clear the fixed disk drive password or give you access
before servicing can be performed.
6. Position the brightness and volume controls approximately in the center
of their range.
7. Insert the Diagnostics diskette into drive A.
8. Turn on the computer.
9. Follow the procedures of the Problem Isolation Flowchart, section 2.4.
Refer to Chapter 3, "Error Messages and Codes," for detailed information
on problem isolation.
Chapter 2.3 Clearing Power On Password
To clear the power on password feature, reset the power on password switch
(SW5) located on the I/O board. To do so, complete the following steps: