HP ProDesk 600 G4 Microtower PC User Manual Page 123
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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 Restore defaults.
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 board? How
would this data be written?
The DIMM SPD memory contains information about the memory board, such as size, serial number, data
width, speed/timing, voltage, and thermal information. This information is written by the board
manufacturer and stored on an EEPROM. This EEPROM cannot be written to when the memory board is
installed in a PC. Third-party tools do exist that can write to the EEPROM when the memory board is not
installed in a PC. 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 PC
conguration data.
6. How can the BIOS security be reset to factory defaults and data erased?
Questions and answers 115
- Maintenance and Service Guide 1
- About This Book 3
- Table of contents 5
- 1 Product features 9
- Front panel components 10
- Rear panel components 11
- Non-vPro systems 12
- 2 Illustrated parts catalog 13
- Computer major components 7 15
- Miscellaneous parts 16
- Miscellaneous parts 9 17
- Miscellaneous parts 11 19
- Miscellaneous parts 13 21
- Miscellaneous parts 15 23
- Miscellaneous parts 17 25
- Miscellaneous parts 19 27
- Miscellaneous parts 21 29
- Miscellaneous parts 23 31
- Generating static 32
- Grounding the work area 33
- Operating guidelines 34
- Routine care 35
- Service considerations 36
- SMART ATA drives 37
- Preparation for disassembly 38
- Access panel 39
- Optical drive 40
- Dust lter 41
- Front bezel 42
- Hard drives 43
- Hard drives 37 45
- Drive cage 46
- Hood sensor switch 47
- WLAN module 49
- Solid-state drive 50
- Memory module 51
- Power supply 53
- Fan-sink 54
- Processor 55
- System board 57
- Connector board 59
- Computer Setup–Main 62
- Computer Setup—Security 64
- Computer Setup—Advanced 66
- Safety and comfort 72
- Helpful hints 73
- Solving general problems 74
- Solving general problems 67 75
- Solving power problems 77
- Solving hard drive problems 78
- Solving display problems 81
- Solving display problems 75 83
- Solving audio problems 85
- Solving printer problems 87
- Solving network problems 91
- Solving network problems 85 93
- Solving memory problems 94
- Solving software problems 97
- 10 System backup and recovery 111
- Using Windows tools 113
- Restore and recovery 113
- A Battery replacement 116
- Current BIOS steps 119
- Nonvolatile memory usage 121
- Questions and answers 123
- Using HP Sure Start 124
- C Power cord set requirements 125
- Country-specic requirements 126
- D Specications 127
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