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====== BIOS, diagnostics and other start-up notes ======


===== Crashed computer =====

Check the [[other:win10crash|Recovering from a Major Hardware or Windows 10 Crash]] section
===== BIOS =====

==== Determining the BIOS version ====

The BIOS version is usually displayed quickly when a computer is booting, and when [[other:bios#entering_the_bios|you are in the BIOS options screen]]

You can also get the BIOS version when your operating system is running!

=== From Windows ===

Use the [[https://support.microsoft.com/en-us/topic/description-of-microsoft-system-information-msinfo32-exe-tool-10d335d8-5834-90b4-8452-42c58e61f9fc|msinfo32]] command (i.e. type ''msinfo32'' in the search field at the bottom left of the screen, and then launch the System Information app) and check the //BIOS version// line in the //system summary// screen. You will also get lots of other useful information about your computer (e.g. computer name)

=== From Linux ===

Use the [[http://manpages.ubuntu.com/manpages/xenial/man8/dmidecode.8.html|dmidecode]] command: ''dmidecode -s bios-version''

<code>$ sudo dmidecode -s bios-version
[sudo] Password for your_login:
1.10.0</code>

==== Entering the BIOS ====

Power off the machine, then power it on again **and** press repeatedly the appropriate key several times while the computer is starting, until you see the BIOS options screen. This should take place **before** you have to type the Windows //bitlocker// password, or the Linux (de)crypting password

|  Dell  |  ''F2 ''  |
|  HP  |  ''ESC''  or ''F10''  |

==== Enabling boot on a USB drive in the BIOS ====

=== Dell BIOS ===

''Settings'' => ''General'' => ''Boot Sequence'': //USB Storage Device// must be selected, and in the first place of the Boot Order

==== Updating the BIOS ====

<WRAP center round important 60%>
Updating the BIOS is safe, but it may be a good idea to get help from somebody who has already done it. Your computer may restart several times, blink, etc, before the update is complete.

Be sure to be connected to a power supply during the update

If your Windows computer is protected by **bitlocker** at boot time, you have to [[https://www.dell.com/support/kbdoc/en-us/000125409/how-to-enable-or-disable-bitlocker-with-tpm-in-windows#TOC05|suspend bitlocker]] (//suspend//, and **not** //disable//), **before rebooting**. [[https://docs.microsoft.com/en-us/troubleshoot/windows-client/windows-security/suspend-bitlocker-protection-non-microsoft-updates|more info]]

The BIOS update will take place during the boot time, then Windows will start and bitlocker will automatically start again </WRAP>

  * **Dell**: 
    * Healthy Windows computer:
      * Start the [[https://www.dell.com/support/kbdoc/en-us/000177325/dell-command-update|Dell Command Update]] program ,look for available updates (BIOS updates and others), and download them\\ ''Start'' => ''Dell Command Update''
      * check the [[https://www.dell.com/support/home/en-us|Dell Support page]], enter your Dell computer Serial Number (if it is not automatically detected), and check the BIOS related information
    * Crashed Windows, or healthy (or crashed) Linux computer: use a USB stick to update the BIOS, following the steps in the [[https://www.dell.com/support/contents/fr-fr/videos/videoplayer/how-to-recover-from-booting-issues-using-the-bios-recovery-tool/6079779755001|How to recover from booting issues using the BIOS Recovery Tool]] video
  * **HP**: \\ <WRAP center round important 60%>
If the BIOS update does not seem to work (no update takes place), check this [[https://wiki.lsce.ipsl.fr/pmip3/doku.php/other:win7towin10#bios_update|HP BIOS update]] section
</WRAP>
    * [[https://support.hp.com/us-en/document/c00007682|HP Consumer Desktop PCs - Updating the BIOS (Basic Input Output System)]]
    * [[https://support.hp.com/us-en/document/c00042629|HP Consumer Notebook PCs - Updating the BIOS (Basic Input Output System)]]
==== Notes ====

There are lots of HP BIOS details in [[http://h10032.www1.hp.com/ctg/Manual/c06399361|HP PC Commercial BIOS (UEFI) Setup - Administration Guide]] (pdf document)

===== Other start-up related notes =====

==== Choosing the boot media or the diagnostics ====

|  Dell  |  ''F12'' (enter the //One-time Boot Menu//)  |
|  HP  |  ''ESC'' and then ''F2''  |

==== Booting in safe mode ====

<WRAP center round tip 60%>
Safe mode <=> //Mode sans échec//
</WRAP>

=== Windows 10 ===

Read the [[other:win10crash#the_windows_recovery_environment_and_the_safe_mode|Windows Recovery Environment (Windows RE) and the Safe Mode]] notes

=== Windows 7 ===


Power off the machine, then power it **and** press the appropriate key at the same time

|  Dell  |  ''F8 ''  |
|  HP  |    |

See also [[/other:win7misc#performing_a_clean_boot_in_windows|Performing a safe clean boot]]

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