Unknown User Password - HP Compaq 6720t Maintenance And Service Manual

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.
Shut down the computer. If you are unsure whether the computer is off, turn the computer on, and then
1.
shut it down through the operating system.
Disconnect all external devices connected to the computer.
2.
Disconnect the power from the computer by first unplugging the power cord from the AC outlet and
3.
then unplugging the AC adapter from the computer.
Remove the battery (see
4.
Remove the real-time clock (RTC) battery (see
5.
on page
Wait approximately 5 minutes.
6.
Replace the RTC battery and reassemble the computer.
7.
Connect AC power to the computer. Do not reinsert any batteries at this time.
8.
Turn on the computer.
9.
All passwords and all CMOS settings have been cleared.
26 Chapter 4 Removal and replacement procedures
Battery on page
52).
29).
System board and system board frame