Unknown user password
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 37
).
5
.
Remove the real-time clock (RTC) battery (see
RTC battery on page 78
).
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.
34 Chapter
4
Removal and replacement procedures
