Resetting The Computer - HP Pavilion dv4200 Maintenance And Service Manual

1.2 Resetting the Computer

If the computer you are servicing has an unknown password,
follow these steps to clear the password. These steps also
clear CMOS:
1. Prepare the computer for disassembly (refer to
"Preparing the Computer for Disassembly,"
information).
2. Remove the real-time clock (RTC) battery (refer to
Section 5.9, "RTC Battery,"
removing and replacing the RTC battery).
3. Wait approximately 5 minutes.
4. Replace the RTC battery and reassemble the computer.
5. Connect AC power to the computer. Do not reinsert any
battery packs at this time.
6. Turn on the computer.
All passwords and all CMOS settings have been cleared.
✎
This procedure does not clear a DriveLock password that has
been set.
Maintenance and Service Guide
for more information on
Product Description
Section 5.3,
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