Compaq 470007-802 Deskpro EN Series of Personal Computers Maintenance and Serv - Page 85

Disabling or Clearing the Power-On and Setup Passwords, CMOS Archive and Restore Power Switch Override

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5.1.3 5.1.4 Disabling or Clearing the Power-On and Setup Passwords 1. Turn off the computer and any external devices, and disconnect the power cord from the power outlet. 2. Disconnect the keyboard, monitor, and any other external devices connected to the computer. 3. Remove the access panel. 4. Locate the header and jumper labeled E49. 5. Remove the jumper from pins 1 and 2. Place the jumper over pin 2 only, in order to avoid losing it. 6. Replace the access panel. 7. Reconnect the external equipment. 8. Plug in the computer and turn on power. Allow the operating system to start. This clears the current passwords and disables the password features. 9. To re-enable the password features, repeat steps 1-4, then replace the jumper on pins 1 and 2. 10. Repeat steps 6-8, then establish new passwords. Refer to the Computer Setup (F10 Setup) instructions to establish new passwords. CMOS Archive and Restore (Power Switch Override) Each time the system starts, the system ROM saves a copy of NVRAM (including CMOS, passwords, and other system variables) in the flash ROM. Should the system become unstable, the last known good copy of NVRAM can be restored using a feature called "power button override." To restore NVRAM, do the following: 1. With the unit powered down, press and release the power button. 2. Immediately after pressing the power button (during POST), press and hold the power button until the unit powers down (about 4 seconds). At the next startup, the ROM detects this "power button override" event and the backup copy of NVRAM is restored. Because of this feature, users cannot power off the computer immediately after powering up. The video display must be active before the computer can be powered off. CAUTION: Unplugging the power cord during POST can corrupt the splash screen. Flashing the ROM is required to restore the splash screen, although the computer will continue to function. Compaq Deskpro EN Series of Personal Computers 5-3

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Compaq Deskpro EN Series of Personal Computers
5-3
5.1.3
Disabling or Clearing the Power-On and Setup Passwords
1.
Turn off the computer and any external devices, and disconnect the power cord from
the power outlet.
2.
Disconnect the keyboard, monitor, and any other external devices connected to the
computer.
3.
Remove the access panel.
4.
Locate the header and jumper labeled E49.
5.
Remove the jumper from pins 1 and 2. Place the jumper over pin 2 only, in order to
avoid losing it.
6.
Replace the access panel.
7.
Reconnect the external equipment.
8.
Plug in the computer and turn on power. Allow the operating system to start. This clears
the current passwords and disables the password features.
9.
To re-enable the password features, repeat steps 1-4, then replace the jumper on
pins 1 and 2.
10.
Repeat steps 6-8, then establish new passwords.
Refer to the Computer Setup (F10 Setup) instructions to establish new passwords.
5.1.4
CMOS Archive and Restore (Power Switch Override)
Each time the system starts, the system ROM saves a copy of NVRAM (including CMOS,
passwords, and other system variables) in the flash ROM.
Should the system become
unstable, the last known good copy of NVRAM can be restored using a feature called
“power button override.” To restore NVRAM, do the following:
1.
With the unit powered down, press and release the power button.
2.
Immediately after pressing the power button (during POST), press and hold the power
button until the unit powers down (about 4 seconds).
At the next startup, the ROM detects this “power button override” event and the backup
copy of NVRAM is restored.
Because of this feature, users cannot power off the computer immediately after powering
up. The video display must be active before the computer can be powered off.
CAUTION:
Unplugging the power cord during POST can corrupt the splash screen. Flashing the
ROM is required to restore the splash screen, although the computer will continue to function.