HP Pro 3400 Maintenance And Service Manual page 153

need to be reset. The AMT settings will also need to be reset. To access the MEBx, press
during POST.
1. Shut down the operating system properly, then turn off the computer and any external devices,
and disconnect the power cord from the power outlet.
2. With the power cord disconnected, press the power button again to drain the system of any
residual power.
WARNING! To reduce the risk of personal injury from electrical shock and/or hot surfaces, be
sure to disconnect the power cord from the wall outlet, and allow the internal system
components to cool before touching.
CAUTION: When the computer is plugged in, the power supply always has voltage applied to
the system board even when the unit is turned off. Failure to disconnect the power cord can
result in damage to the system.
Static electricity can damage the electronic components of the computer or optional equipment.
Before beginning these procedures, ensure that you are discharged of static electricity by briefly
touching a grounded metal object. See the Safety & Regulatory Information guide for more
information.
3. Remove the access panel.
4. Locate the header and jumper labeled CLR_CMOS on models 3400/3405 or CMOS on model
3410.
NOTE: The password jumper is blue so that it can be easily identified. For assistance locating
the password jumper and other system board components, see the Illustrated Parts & Service
Map (IPSM). The IPSM can be downloaded from http://www.hp.com/support.
5. Remove the jumper from pins 2 and 3.
6. Place the jumper on pins 1 or 2.
7. Put the jumper back on pins 2 or 3.
8. Replace the access panel.
9. Reconnect the external equipment.
10. Plug in the computer and turn on power. Allow the operating system to start. This clears the
current passwords and disables the password features.
NOTE: You will receive POST error messages after clearing CMOS and rebooting advising you that
configuration changes have occurred. Use Computer Setup to reset any special system setups along
with the date and time.
For instructions on Computer Setup, see Computer Setup (F10) Utility on page 7.
Clearing and Resetting the CMOS 143
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