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Unknown user password
NOTE: This process will not work if Stringent Security is enabled in F10 Setup. Stringent Security
installs passwords into the ROM so that it is not affected when the RTC battery is removed.
If the computer you are servicing has an unknown user password, follow these steps to clear the
password:
NOTE: These steps also clear CMOS.
1. Shut down the computer. If you are unsure whether the computer is off or in Hibernation, turn the
computer on, and then shut it down through the operating system.
2. Disconnect all external devices connected to the computer.
3. Disconnect the power from the computer by first unplugging the power cord from the AC outlet and
then unplugging the AC adapter from the computer.
4. Remove the battery (see
Battery on page 41).
5. Remove the real-time clock (RTC) battery (see
RTC battery on page 58).
6. Wait approximately 5 minutes.
7. Replace the RTC battery and reassemble the computer.
8. Connect AC power to the computer. Do not reinsert any batteries at this time.
9. Turn on the computer.
All passwords and all CMOS settings have been cleared.
38 Chapter 4 Removal and replacement procedures