Maintenance and Service Guide
Questions and answers
1. How can the BIOS settings be restored (returned to factory settings)?
1. Turn on or restart the computer and press F10 as soon as the HP logo appears.
2. Select the Main menu, then select Apply Factory Defaults and Exit.
2. What kind of conguration data is stored on the DIMM Serial Presence Detect (SPD) memory module? How
would this data be written?
The DIMM SPD memory contains information about the memory module such as size, serial number, data
width, speed/timing, voltage, and thermal information. This information is written by the module
manufacturer and stored on an EEPROM. There are various third-party tools available to read and write
SPD memory.
3. Does the DIMM SPD memory need to be cleared?
The DIMM SPD memory will not be modied during standard operation of the workstation system. It will
not hold any user data or settings. This NVM memory could potentially be vulnerable due to the fact that it
can be modied freely using third-party tools. If there is a possibility that the DIMM SPD region has been
tampered with, HP recommends either re-writing the DIMM SPD with third-party tools or destroying the
DIMM modules.
4. What information does the NIC EEPROM hold?
The only system-specic data that the NIC EEPROM will hold are the system MAC addresses. The other
information in the EEPROM is the LAN settings which are not able to be modied outside of the HP factory.
The NIC EEPROM will not contain user-settings or data.
5. Does resetting the CMOS conguration memory return the computer back to factory defaults?
The process of resetting the CMOS will return certain system settings to factory default but will not reset
many of the system data and conguration defaults to their factory settings. To return these system data
and conguration defaults to factory settings, refer to question/answer 1 and follow the instructions for
returning the BIOS settings to factory defaults.
Using HP Sure Start
The Generation 4 Z-workstations are congured with HP Sure Start, a technology that continuously monitors the
computer's BIOS for attacks or corruption. If the BIOS becomes corrupted or is attacked, HP Sure Start restores
the BIOS to its previous safe state, without user-intervention. HP Sure Start is congured and already enabled so
that most users can use the HP Sure Start default conguration. The default conguration can be customized by
advanced users.
Questions and answers 99