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Article Number: 000124377

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How to Perform a BIOS or CMOS Reset and Clear the NVRAM on Dell Systems

Summary: This Article shows how to Perform a BIOS or CMOS Reset and/or Clear the NVRAM on your Dell System

This article may have been automatically translated. If you have any feedback regarding its quality, please let us know using the form at the bottom of this page.

Article Content

Symptoms

Load BIOS to defaults

Duration: 00:24
Closed captions: English only

The information stored in the BIOS (System Setup), known as Extended System Configuration Data (ESCD) can occasionally become corrupt due to various reasons such as power events, incorrect settings, hardware incompatibility due to a specific setting, or a turn on self-test (POST) or video issues. In these cases, it is sometimes necessary to reset the BIOS or CMOS (Complementary metal–oxide–semiconductor) to factory default settings, or in other circumstances, clear the nonvolatile random access memory (NVRAM).

Cause

WARNING: The BIOS interface is designed for advanced users. Be sure about what changes you are making in the BIOS. Accidentally changing an unknown setting can prevent the computer from turning on, booting into the operating, or can cause potential loss of data.

Resolution

How to reset the BIOS from the BIOS interface

NOTE: This process resets the BIOS to factory default settings, it does not clear the CMOS or NVRAM.
  1. Turn on the computer.
  2. Tap the F2 key several times until Entering Setup appears.
  3. Reset the BIOS to factory defaults. The method to reset the BIOS varies between different computers:
    1. Click the Load defaults button.
    2. Or, press the F9 key to load default settings.
    3. Or, press the Alt+F key to load default settings.
  4. Press the Esc key and select Save and exit or Exit.
  5. Press the Enter key to save all changes and exit the BIOS setup screen.
  6. The computer will restart.

How to clear the BIOS, CMOS, or NVRAM using a jumper on a desktop computer

WARNING: Clearing the CMOS or NVRAM using a jumper resets the passwords in the BIOS. This includes the BIOS user password, admin password, and hard drive password. This does not include any other passwords such as Windows log in, online accounts, and so on.
 
NOTE: The RTCRST/PSWD jumper is not available on all Dell desktops. For Dell desktops that does not have an RTCRST jumper, see the Dell knowledge base article How to Reset Real Time Clock (RTC) to Recover Your Dell Desktop System.
 
NOTE: The RTCRST/PSWD jumper is not available on Dell laptops.

The Real-Time Clock Reset (RTCRST) jumper helps reset or clear the NVRAM on the computer. The ESCD information that is contained in the NVRAM can be cleared by following the steps that are mentioned below. The NVRAM is cleared when the jumper is set to the closed position and turning on the computer for 10 seconds.

NOTE: Dell desktop computers can be recovered from a turn on self-test or video failure by clearing the CMOS or NVRAM.
 
NOTE: The location of the RTCRST and PSWD jumper will vary between different Dell desktops. For more information about jumper locations, see the User Manual of the Dell desktop.
  1. Before you begin, follow the Safety Precautions When Working with Electronic and Electrical Equipment.
  2. Turn off the computer and disconnect the power cable from the computer.
  3. Remove the computer cover. For model-specific information, see the User Manual of the Dell desktop.
  4. Locate the 2-pin password jumper labeled PSWD on the system board.
  5. Remove the 2-pin jumper plug.
  6. Locate the 2-pin CMOS jumper labeled RTCRST on the system board.
  7. Move the 2-pin jumper plug from the password jumper to the pins on the CMOS jumper.
  8. Plug the power cable to the computer and wait for 10 seconds for the CMOS to clear.
  9. Disconnect the power cable from the computer
  10. Move the 2-pin jumper plug back to the password jumper.
  11. Replace the computer cover. For model-specific information, see the User Manual of the Dell desktop.
  12. Connect the power cable to the computer and turn on the computer.

Illustration of the PSWD and RTCRST jumpers on the system board of a Dell desktop
Figure 1: Illustration of the jumpers on the system board of a Dell desktop computer.

How to clear the BIOS, CMOS, or NVRAM by reseating the CMOS battery

The BIOS can be reset to factory defaults my reseating the CMOS battery that is connected to the system board. This process is applicable for both Dell desktops and laptops. Follow the steps below if the PSWD or RTCRST jumpers are not accessible on a Dell desktop or if you are using a Dell laptop.

WARNING: Clearing the CMOS or NVRAM by reseating the CMOS battery resets the passwords in the BIOS. This includes the BIOS user password, admin password, and hard drive password. This does not include any other passwords such as Windows log in, online accounts, and so on.
 
NOTE: The CMOS battery cannot be reseated on all Dell laptops. For model-specific information, see the User Manual of the Dell computer.
  1. Before you begin, follow the Safety Precautions When Working with Electronic and Electrical Equipment.
  2. Turn off the computer and disconnect the power cable from the computer.
  3. If you are using a Dell laptop, disconnect the battery from the computer. For model-specific information, see the User Manual of the Dell computer. If your Dell laptop has a nonremovable battery, see the Dell knowledge base article How to Reset Real Time Clock (RTC) to Recover Your Dell Laptop.
  4. Remove the computer cover. For model-specific information, see the User Manual of the Dell computer.
  5. Locate the CMOS coin-cell battery (Figure 2 and 3).
  6. Carefully, disconnect the coin-cell battery from the system board.
  7. Press and hold the power button for 10-2- seconds to drain residual power.
  8. Connect the coin-cell battery to the system board.
  9. Close the computer cover.
  10. Connect the battery and the power cable to the computer.
  11. Turn on the computer.
  12. A warning message will appear indicating that the date and time is not set.
  13. Press the F2 key to enter the BIOS screen.
  14. Set the date and time according to your time zone.
  15. Save and exit the BIOS screen.

Illustration of a coin-cell battery on the system board of a Dell desktop
Figure 2: Illustration of a coin-cell battery on the system board of a Dell desktop

Illustration of a coin-cell battery on the system board of a Dell laptop
Figure 3: Illustration of a coin-cell battery on the system board of a Dell laptop

Additional Information

Out of Warranty support Out of warranty? No problem. Browse the Dell.com/support website and enter your Dell Service Tag and view our offers.

NOTE: Offers are only available for US, Canada, UK, France, Germany, and China personal computer customers. Server and Storage not applicable.

Article Properties

Affected Product

Desktops & All-in-Ones, Laptops, Inspiron, Latitude, Vostro, XPS, Retired Models, Fixed Workstations, Inspiron 3452, Inspiron 15 7572, Inspiron 7580, Inspiron 3052, Inspiron 20 3064, Inspiron 3264 AIO, Inspiron 3265, Inspiron 3452 AIO, Inspiron 3455Desktops & All-in-Ones, Laptops, Inspiron, Latitude, Vostro, XPS, Retired Models, Fixed Workstations, Inspiron 3452, Inspiron 15 7572, Inspiron 7580, Inspiron 3052, Inspiron 20 3064, Inspiron 3264 AIO, Inspiron 3265, Inspiron 3452 AIO, Inspiron 3455, Inspiron 24 3464, Inspiron 24 5488, Inspiron 27 7775, Inspiron 3252, Inspiron 3268, Inspiron 3655, Inspiron 3668, Latitude 5290 2-in-1, Latitude 7290, Latitude 3390 2-in-1, Latitude 7390 2-in-1, Latitude 7390, Latitude 3490, Latitude 5490, Latitude 5491, Latitude 7490, Latitude 3590, Latitude 5590, Latitude 5591, OptiPlex 3050 All-In-One, OptiPlex 3050, OptiPlex 3060, OptiPlex 5050, OptiPlex 5060, OptiPlex 5250 All-In-One, OptiPlex 7050, OptiPlex 7060, OptiPlex 7450 All-In-One, OptiPlex 7460 All-In-One, OptiPlex 7760 All-In-One, Vostro 5370, Vostro 5471, Vostro 15 3568, Vostro 3578, Vostro 15 5568, Vostro 3470, Vostro 3670, XPS 27 7760, XPS 8920See more

Last Published Date

07 Jun 2021

Version

11

Article Type

Solution