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 39
).
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.
36
Chapter 4 Removal and replacement procedures
Summary of Contents for 550 - Notebook PC
Page 1: ...HP 550 Notebook PC Maintenance and Service Guide ...
Page 4: ...iv Safety warning notice ...
Page 23: ...Computer major components Computer major components 15 ...
Page 127: ...8 Backup and recovery 119 ...
Page 150: ......
