3
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.
Before disassembling the computer, follow these steps:
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 cord.
4
.
Remove the battery (see
Battery on page 36
).
5
.
Remove the real-time clock (RTC) battery (see
RTC battery on page 62
).
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.
14 Chapter
3
Unknown user password
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