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Questions and answers
1. How can the BIOS settings be restored (returned to factory settings)?
IMPORTANT: Restore defaults does not securely erase any data on your hard drive. See question and
answer 6 for steps to securely erase data.
Restore defaults does not reset the Custom Secure Boot keys. See question and answer 7 for
information about resetting the keys.
a. Turn on or restart the computer, and then press esc while the “Press the ESC key for Startup Menu”
message is displayed at the bottom of the screen.
b. Select Main, and then select Apply Factory Defaults and Exit.
c. Follow the on-screen instructions.
d. Select Main, select Save Changes and Exit, and then follow the on-screen instructions.
2. What is a UEFI BIOS, and how is it dierent from a legacy BIOS?
The Unied Extensible Firmware Interface (UEFI) BIOS is an industry-standard software interface
between the platform rmware and an operating system (OS). It is a replacement for the older BIOS
architecture, but supports much of the legacy BIOS functionality.
Like the legacy BIOS, the UEFI BIOS provides an interface to display the system information and
conguration settings and to change the conguration of your computer before an OS is loaded. BIOS
provides a secure run-time environment that supports a Graphic User Interface (GUI). In this
environment, you can use either a pointing device (Touchscreen, TouchPad, pointing stick, or USB
mouse) or the keyboard to navigate and make menu and conguration selections. The UEFI BIOS also
contains basic system diagnostics.
The UEFI BIOS provides functionality beyond that of the legacy BIOS. In addition, the UEFI BIOS works to
initialize the computer’s hardware before loading and executing the OS; the run-time environment
allows the loading and execution of software programs from storage devices to provide more
functionality, such as advanced hardware diagnostics (with the ability to display more detailed system
information) and advanced rmware management and recovery software.
HP has provided options in Computer Setup (BIOS) to allow you to run in legacy BIOS, if required by the
operating system. Examples of this requirement would be if you upgrade or downgrade the OS.
3. Where does the UEFI BIOS reside?
The UEFI BIOS resides on a ash memory chip. A utility is required to write to the chip.
4. 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. This EEPROM cannot be written to when the memory module is
installed in a computer. Third-party tools do exist that can write to the EEPROM when the memory
module is not installed in a computer. Various third-party tools are available to read SPD memory.
5. What is meant by “Restore the nonvolatile memory found in Intel-based system boards”?
This message relates to clearing the Real Time Clock (RTC) CMOS memory that contains computer
conguration data.
6. How can the BIOS security be reset to factory defaults and data erased?
Questions and answers 131
- Maintenance and Service Guide 1
- Safety warning notice 3
- Table of contents 5
- 1 Product features 9
- Front panel components 10
- Rear panel components 11
- Serial number location 11
- 2 Illustrated parts catalog 12
- Computer major components 5 13
- Miscellaneous parts 15
- Generating static 17
- Grounding the work area 18
- Operating guidelines 19
- Routine care 20
- Service considerations 21
- Cables and connectors 22
- Hard Drives 22
- Lithium coin cell battery 22
- SATA hard drives 23
- SATA data cable 23
- SMART ATA drives 23
- Cable management 24
- Preparation for disassembly 25
- Access panel 26
- Front bezel 27
- Front bezel dust lter 29
- System board connections 30
- Populating DIMM sockets 31
- Removing and installing DIMMs 32
- Expansion card 34
- Expansion card 27 35
- Drive positions 38
- Drives 35 43
- Drives 37 45
- Drive cage 48
- WLAN module 54
- Hood lock 55
- Card reader 56
- Antennas 57
- Air duct 59
- Option board 60
- Optional rear port 61
- Fan sink 62
- Up to 65 W processor models 63
- 95 W processor models 63
- Fan sink 55 63
- Processor 66
- Power supply 67
- System board 69
- System board callouts 72
- Computer Setup–Main 76
- Computer Setup—Security 78
- Computer Setup—Advanced 81
- Computer Setup—UEFI Drivers 86
- Safety and comfort 87
- Helpful hints 88
- Solving general problems 89
- Solving general problems 83 91
- Solving power problems 93
- Solving hard drive problems 94
- Solving display problems 97
- Solving display problems 91 99
- Solving audio problems 101
- Solving printer problems 103
- Solving network problems 106
- Solving network problems 99 107
- Solving memory problems 109
- Solving software problems 114
- Resetting the password jumper 122
- A Battery replacement 130
- B Power cord set requirements 133
- Country-Specic Requirements 134
- Nonvolatile memory usage 137
- Questions and answers 139
- D Specications 141
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