How do I run pre boot diagnostics?
Self-Heal

  1. Remove the primary battery and the AC adapter.
  2. Disconnect the CMOS battery.
  3. Release the flea power.
  4. Make sure the CMOS and primary battery are not plugged into the system.
  5. Plug in the AC adapter.
  6. The system will start with a blank screen for a while and will shut down automatically.

Entering BIOS without keyboard

  1. Press the power button to turn on your tablet.
  2. Press and hold the Volume Up button when the Dell logo appears on the screen.
  3. When the F12 boot selection menu appears, select BIOS Setup using the Volume Up button.
  4. Press the Volume Down button to enter BIOS setup program.

Self-heal can only be initiated when the coin cell battery & primary battery are not connected to the system. When self-heal is triggered, system will auto power-on with a blank screen, reboots a couple of times (watch for the LED lights, Power, Wi-Fi, HDD Etc.…).

How to run Dell pre boot diagnostics : Turn on your computer. At the Dell logo, press the F12 key several times until the One Time Boot Menu appears. On the boot menu screen, select the Diagnostics option (Figure 1.) The diagnostic quick test begins (Figure 2.)

How do I fix a corrupted BIOS on a Dell laptop

BIOS recovery for Dell laptops

  1. Allow the laptop to charge to at least 10%.
  2. Turn the laptop off, and disconnect the power adapter.
  3. Press and hold the CTRL + ESC keys on the keyboard.
  4. Connect the power adapter.
  5. On the BIOS Recovery screen, select Reset NVRAM (if the option is available) and press the Enter key.

How do I force BIOS to open without keyboard : Entering the BIOS without a Keyboard from Windows

  1. In the taskbar, touch .
  2. Touch .
  3. Under Advanced startup, touch. Restart now. . Windows shuts down.
  4. Troubleshoot. .
  5. Advanced options. .
  6. UEFI Firmware Settings. .
  7. Restart. .

You can also use the Command Prompt to access the BIOS without restarting. To do this, open the Command Prompt as an administrator. Type “shutdown /r /o” and press Enter. This will restart the computer and open the BIOS.

How to Run BIOS Auto Recovery Dell from the Primary Hard Drive

  1. Turn off your Dell laptop and disconnect the AC adapter.
  2. Press and hold the Ctrl + Esc keys and reconnect the AC adapter.
  3. Release the Ctrl + Esc keys until the BIOS Recovery Menu screen pops up.
  4. Select the Reset NVRAM option if available and press Enter.

How do I run F12 Diagnostics

At the Dell logo screen, press F12. At the one-time boot menu, press the down arrow key to highlight diagnostics, then press enter to begin EPSA. Write down any error codes listed. You may then research the error codes in our support.Dell.com website for a recommended solution or a quick fix.To reboot in a diagnostic startup:

Press WINDOWS-R on the keyboard to bring up the Run window, enter MSCONFIG and click OK. Under the General tab, click "Diagnostic startup."You can do this one of three ways:

  1. Boot into the BIOS and reset it to the factory settings. If you are able to boot into the BIOS, go ahead and do so.
  2. Remove the CMOS battery from the motherboard. Unplug your computer and open your computer's case to access the motherboard.
  3. Reset the jumper.


The most common symptoms of a corrupted BIOS in a laptop or any other computer are:

  1. The laptop stopped working after the BIOS was updated.
  2. The laptop just died.
  3. Laptop turns on and then off.
  4. Computer thinks its temperature is too high.
  5. Laptop turns on but the screen remains black.

How do I manually open BIOS : Steps

  1. Here's a list of some of the most common setup keys by manufacturer: Acer: F2 or DEL. ASUS: F2 or Del. Dell: F2 or F12. HP: ESC or F10. Lenovo: F2 or Fn + F2. Lenovo Desktops: F1. Lenovo ThinkPads: Enter + F1.
  2. If you don't hit the key in time, Windows will load and you will have to reboot and retry.

How do I get to the boot menu if my keyboard is not working : You can use this method to directly boot to BIOS options if the problem persists.

  1. Go to start.
  2. Hold “shift” key and click on “restart” option.
  3. Various options will come on the screen.
  4. Now select “Advance options” and choose “UEFI Firmware Settings”.
  5. Then, click on “restart”.
  6. You will boot directly into BIOS options.

How do I force BIOS to boot

To boot to UEFI or BIOS:

Common keys used: Esc, Delete, F1, F2, F10, F11, or F12. On tablets, common buttons are Volume up or Volume down (find more common keys and buttons). During startup, there's often a screen that mentions the key.

However, a common way to enter BIOS setup is to press a specific key or a combination of keys during the startup process, before the Windows logo appears. The key or keys may differ depending on your computer, but some of the most common ones are F1, F2, F10, F12, Del, or Esc.BIOS recovery for Dell laptops

  1. Allow the laptop to charge to at least 10%.
  2. Turn the laptop off, and disconnect the power adapter.
  3. Press and hold the CTRL + ESC keys on the keyboard.
  4. Connect the power adapter.
  5. On the BIOS Recovery screen, select Reset NVRAM (if the option is available) and press the Enter key.

How to do preboot diagnostics : The preboot diagnostics provides options for particular devices or device groups. To enter the test: Turn on your computer. At the Dell logo, press the F12 key several times until the One Time Boot Menu appears.