HP EliteDesk 705 35W G4 Desktop Mini PC Manuel d'utilisateur Page 113
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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 105
- 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 14
- Miscellaneous parts 7 15
- Generating static 16
- Grounding the work area 17
- Operating guidelines 18
- Routine care 19
- Service considerations 20
- Hard Drives 21
- Lithium coin cell battery 21
- SATA hard drives 22
- Warnings and cautions 23
- Preparation for disassembly 24
- Front bezel dust lter 24
- Access panel 25
- Front bezel 26
- Hood sensor 27
- Hard drive 29
- Hard drive connector 30
- Drive cage 31
- WLAN module 35
- Expansion connector board 39
- Memory modules 40
- Memory modules 35 43
- Heat sink 45
- Processor 47
- System board 48
- System board components 51
- Internal WLAN antenna cables 52
- Computer Setup–Main 57
- Computer Setup—Security 59
- Computer Setup—Advanced 62
- Computer Setup—UEFI Drivers 66
- Safety and comfort 67
- Helpful hints 68
- Solving general problems 69
- Solving general problems 63 71
- Solving power problems 72
- Solving hard drive problems 73
- Solving display problems 76
- Solving display problems 69 77
- Solving display problems 71 79
- Solving audio problems 80
- Solving printer problems 81
- Solving network problems 85
- Solving memory problems 87
- Solving software problems 90
- Solving software problems 83 91
- Resetting the password jumper 99
- A Power Cord Set Requirements 107
- Country-Specic Requirements 108
- Nonvolatile memory usage 111
- Questions and answers 113
- C Specications 115
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