Tip & How-To about Computers & Internet

How to clear an unknown BIOS password.

Clear using jumper (recommended)

Precaution: When inside the computer please be sure you're aware of the potential damage that can be caused by ESD.

On the computer motherboard locate the BIOS clear / password jumper or dipswitch and change its position. This jumper is often labeled CLEAR, CLEAR CMOS, JCMOS1, CLR, CLRPWD, PASSWD, PASSWORD, PSWD or PWD as shown in the picture to the right. To change the jumper simply remove it from the two pins its currently on so that it covers the pin that is not covered. For example, in the picture to the right pins 1 and 2 are covered, you'd remove the jumper and put it on pins 2 and 3.

Once this jumper has been changed, turn on the computer and the password should be cleared. Once cleared, turn the computer off and return the jumper or dipswitch to its original position.

The location of the jumpers or dipswitches are dependent on the manufacturer of the computer and motherboard. However, below are some general ideas on where to find it. Remember that most motherboards could have dozens of different jumpers, make sure you're changing the CMOS jumper and not something else. If these general suggestions do not help refer to your motherboard / computer documentation or skip to the next step.

  1. On the edge of the motherboard - Most jumpers are located on the side of the motherboard for easy accessibility, verify by looking at all visible edges of the motherboard.
  2. By the CMOS battery - Some manufactures will place the jumper to clear the CMOS / BIOS password by the actual CMOS battery.
  3. By the processor - Some manufactures will place the jumpers by the processor of the computer.
  4. Under the keyboard or bottom of laptop - If you are working on a laptop computer the location of the dipswitch (almost never a jumper) can be under the keyboard or on the bottom of the laptop in a compartment such as the memory compartment.
  5. Other visible location - While it is possible that the jumpers / dipswitches may not be in a visible location, most manufactures try to make things easier by placing the jumpers / dipswitches in another visible location.
Remove CMOS battery

Removing the CMOS battery like the one shown in the picture to the right will cause the system to loose all CMOS settings including the password. To do this locate and remove the CMOS battery on themotherboard for at least five-minutes. After this has been done put the battery back into the computer and turn it back on.
Jump the CMOS solder beads

Older computers and especially older laptops don't have jumpers or dipswitches and require the user to jump a pair of solder beads on a circuit board. The identification and location of these solder beads can vary and if not available in computer documentation is only obtainable through the computer manufacturer.

If you've identified the solder beads they can be jumped by placing a flat-head screwdriver over the two beads and leaving it on those beads while turning on the computer. Once the computer has booted turn off the computer and then remove the screwdriver.

Posted by on

Computers & Internet Logo

Related Topics:

Related Questions:

1 Answer

forgot my dell 531s password


CMOS stands for Complementary metal--oxide--semiconductor and is a type of microprocessor that is used to store a computer's basic input/output system, or BIOS. The BIOS is a small set of instructions designed to get the computer up and running and to load the operating system. Clearing the CMOS will return all BIOS settings to their defaults. This can be useful when diagnosing computer problems. The Dell Inspiron 531 desktop computer contains a clear CMOS jumper on the motherboard that will allow you to easily clear the BIOS settings.

Prepare the computer for service by first shutting it down and then disconnecting the power cable and all peripheral devices attached to the computer. Place the computer onto its left side as you face it from the rear. Use a flat-blade screwdriver to remove the two screws from the rear of the case that hold the cover on. Pull the cover toward the rear of the case a few inches and then lift it off the case to expose the motherboard and other internal components. WARNING: Before you start troubleshooting remember that you are dealing with electricity that can KILL. http://www.kitchentablecomputers.com/static.php - rules Only work inside the computer case when the power has been switched off and disconnected. Never open the power source. Some of the below steps recommend removing physical parts within the computer. While in the computer it is highly recommend that you be aware of ESD and its potential hazards Attach your anti-static wrist strap. Make sure you attach the clip to an unpainted metal surface on the computer chassis. This will ground you and prevent a static electric discharge which can damage sensitive computer parts like the RAM modules and processor. Locate the jumper located along the edge of the motherboard furthest from you as you face the rear of the computer. It has two rows of three pins each. The clear CMOS jumper is the set of three pins closest to the rear of the computer. Remove the jumper from its current position on pins one and two and place it onto pins two and three. Wait approximately five minutes for the CMOS to clear and replace the jumper onto pins one and two. The CMOS settings are now reset to the defaults. owner manual index http://support.dell.com/support/edocs/systems/inspd531/en/om/appendix.htm - wp1141353 owner manual
http://support.dell.com/support/edocs/systems/inspd531/en/om/parts.htm - wp1595069

Mar 12, 2013 | Dell Inspiron 531s Desktop Computer

1 Answer

fan runs flat out after power cut - HP p6769uk Pavilion desktop


WARNING: Before you start troubleshooting remember that you are dealing with electricity that can KILL. http://www.kitchentablecomputers.com/static.php - rules Only work inside the computer case when the power has been switched off and disconnected. Never open the power source. Some of the below steps recommend removing physical parts within the computer. While in the computer it is highly recommend that you be aware of ESD and its potential hazards Might have dried up thermal paste Check you CPU central processing unit make sure its securely seated and has thermal paste it might be getting to hot the thermal paste will help disperse the heat Thermal compound is a sticky paste that is placed directly onto the CPU. http://www.hardwaresecrets.com/article/Thermal-Compound-Roundup-February-2012/1490 Allowing for a more direct heat transfer between the CPU and HEAT SINK and preventing air gaps from forming between the CPU and heat sink. It might be as simple as resetting cmos or physically unplugging the fan then plugging it back in. b> CMOS Reset Jumper b> Desktop computer motherboards often have jumpers for resetting the motherboard CMOS. If you made a mistake when changing the configuration of your motherboard in the setup utility and used the CMOS reset jumper to clear the change, your computer may not power on until you return the jumper to its original position.
Power Supply Failure b> If you are using a pre-built computer from a manufacturer, the most likely scenario is that the power supply has failed. Some computer power supplies are able to support 110 volt connections for the U.S. and 220 volt connections for other areas. Check the back of your computer's power supply and ensure that the switch points to the 110 volt marker. In addition, confirm that the power cable is seated firmly on the back of the computer and at the power outlet. If your computer still does not power on, call the manufacturer for assistance.
Typically, a computer fan will run off and on while the computer is being used to keep the internal parts of the computer cool. Without these fans, the hardware inside the computer will overheat. However, when a fan runs constantly, it is a sign of a potential hardware problem and should be addressed immediately.

Dust
The presence of too much dust inside a computer CPU (central processing unit The dirt on the internal components of the hard drive acts as insulation and will cause the temperature of the computer to increase, making the fan run constantly to compensate. If this occurs, the computer can overheat and damage delicate and important computer parts. Clean dust with a vacuum attachment or compressed air can---never blow on internal parts, as the moisture from your breath can cause corrosion and damage. b> Room Temperature b> Computers can become damaged if the room temperature or the area directly around the computer exceeds 90 degrees. If the computer is located next to a heater or other area where excessive heat is produced, this can cause the fans to run constantly. Move the computer into a cooler room or a spot with greater air circulation. Computer Temperature b> The internal temperature of the computer can also cause the fans to run all the time. This most often occurs when the processor or other computer hardware parts are overclocked, or modified to perform beyond its designed speed. Overclocking the computer processor makes it run faster, but it also causes it to run hot. Additional fans and cooling mechanisms are required to keep an overclocked computer cool. b> Blocked Vent b> If the vent to the computer is blocked, there is nowhere for the fan to send the hot air. The hot air is continually recirculated back inside the computer, which keeps the fans operating all the time. The only way to prevent this is to make sure there is at least 6 inches of clear space around a computer. Placing a computer inside a cabinet or desk will also cause the fan to run too much. Computers should be placed in an area that receives plenty of ventilation. b> Hope this helps

Dec 20, 2012 | HP Pavilion a6532f Desktop PC

1 Answer

I need to clear the password of the bios. For some reason is locked now. After 3 attempts I've got a Key:65409952


For a Desktop computer:


When inside the computer be sure you're aware of the potential damage that can be caused by ESD.


jumper.jpg


1. On the computer motherboard locate the BIOS clear / password jumper or dipswitch and change its position. This jumper is often labeled CLEAR, CLEAR CMOS, JCMOS1, CLR, CLRPWD, PASSWD, PASSWORD, PSWD or PWD as shown in the picture to the right. To change the jumper remove it from the two pins its currently on so that it covers the pin that is not covered. For example, in the picture to the right pins 1 and 2 are covered, you'd remove the jumper and put it on pins 2 and 3.

2. Once this jumper has been changed, turn on the computer and the password should be cleared. Once cleared, turn the computer off and return the jumper or dipswitch to its original position.

The location of the jumpers or dipswitches are dependent on the manufacturer of the computer and motherboard. However, below are some general ideas on where to find it. Remember that most motherboards could have dozens of different jumpers, make sure you're changing the CMOS jumper and not something else. If these general suggestions do not help refer to your motherboard / computer documentation or skip to the next step.

The above instructions are from the following page: http://www.computerhope.com/issues/ch000235.htm

Instructions for a Laptop: http://www.computerhope.com/issues/ch001302.htm

Apr 11, 2011 | Computers & Internet

1 Answer

my leptop ibm thinkpad A22P is lock with bios password not opned my leptop


Answer: If you encounter a password prompt at boot or the BIOS / CMOS setup is locked as shown below and you do not know the password you will need to clear the BIOS password using the suggestions listed below.

cmospass.jpg Generic BIOS / CMOS passwords

Try using generic CMOS passwords. A complete listing of these passwords can be found on document CH000451.
Use a BIOS password utility

There are utilities designed to help bypass CMOS passwords. An example of a great utility to decrypt / bypass BIOS passwords is the PC BIOS Security and Maintenance toolkit, which is available by clicking here.
Clear using jumper (recommended)

Precaution: When inside the computer please be sure you're aware of the potential damage that can be caused by ESD.

jumper.jpgOn the computer motherboard locate the BIOS clear / password jumper or dipswitch and change its position. This jumper is often labeled CLEAR, CLEAR CMOS, JCMOS1, CLR, CLRPWD, PASSWD, PASSWORD, PSWD or PWD as shown in the picture to the right. To change the jumper simply remove it from the two pins its currently on so that it covers the pin that is not covered. For example, in the picture to the right pins 1 and 2 are covered, you'd remove the jumper and put it on pins 2 and 3.

Once this jumper has been changed, turn on the computer and the password should be cleared. Once cleared, turn the computer off and return the jumper or dipswitch to its original position.

The location of the jumpers or dipswitches are dependent on the manufacturer of the computer and motherboard. However, below are some general ideas on where to find it. Remember that most motherboards could have dozens of different jumpers, make sure you're changing the CMOS jumper and not something else. If these general suggestions do not help refer to your motherboard / computer documentation or skip to the next step.

  1. On the edge of the motherboard - Most jumpers are located on the side of the motherboard for easy accessibility, verify by looking at all visible edges of the motherboard.
  2. By the CMOS battery - Some manufactures will place the jumper to clear the CMOS / BIOS password by the actual CMOS battery.
  3. By the processor - Some manufactures will place the jumpers by the processor of the computer.
  4. Under the keyboard or bottom of laptop - If you are working on a laptop computer the location of the dipswitch (almost never a jumper) can be under the keyboard or on the bottom of the laptop in a compartment such as the memory compartment.
  5. Other visible location - While it is possible that the jumpers / dipswitches may not be in a visible location, most manufactures try to make things easier by placing the jumpers / dipswitches in another visible location.
Remove CMOS battery

cmos.gifRemoving the CMOS battery like the one shown in the picture to the right will cause the system to loose all CMOS settings including the password. To do this locate and remove the CMOS battery on the motherboard for at least five-minutes. After this has been done put the battery back into the computer and turn it back on.
Jump the CMOS solder beads

Older computers and especially older laptops don't have jumpers or dipswitches and require the user to jump a pair of solder beads on a circuit board. The identification and location of these solder beads can vary and if not available in computer documentation is only obtainable through the computer manufacturer.

If you've identified the solder beads they can be jumped by placing a flat-head screwdriver over the two beads and leaving it on those beads while turning on the computer. Once the computer has booted turn off the computer and then remove the screwdriver.

PLEASE ACCEPTT

Nov 17, 2010 | IBM (08K3261) for ThinkPad A20P, A20M,...

1 Answer

i forget my bios password


Answer: If you have mistakenly forgot or lost your BIOS password or you receive a password at boot that you do not know, you will need to clear the BIOS password by one of the below methods. Precaution: When inside the computer please be sure of the potential of ESD.
  • Try using generic BIOS passwords. A complete listing of these passwords can be found on document CH000451.
  • There are utilities designed to help bypass BIOS passwords. An example of a great utility to decrypt / bypass BIOS passwords is the PC BIOS Security and Maintenance toolkit, which is available by clicking here.
  • On the computer motherboard locate the BIOS clear / password jumper or dipswitch and change its position. Once this jumper has been changed, turn on the computer and the password should be cleared. Once cleared, turn the computer off and return the jumper or dipswitch to its original position.
The location of the jumpers or dipswitches may vary; however, here are general locations where these jumpers / dipswitch may be located.
  1. On the edge of the motherboard - Most jumpers are located on the side of the motherboard for easy accessibility, verify by looking at all visible edges of the motherboard.
  2. By the CMOS battery - Some manufactures will place the jumper to clear the CMOS / BIOS password by the actual CMOS battery.
  3. By the processor - Some manufactures will place the jumpers by the processor of the computer. However, note that in some cases these jumpers will be to change the processor and not the password.
  4. Under the keyboard or bottom of laptop - If you are working on a laptop computer the location of the dipswitch (almost never a jumper) can be under the keyboard or on the bottom of the laptop in a compartment such as the memory compartment.
  5. Other visible location - While it is possible that the jumpers / dipswitches may not be in a visible location, most manufactures try to make things easier by placing the jumpers / dipswitches in another visible location.
Additionally, when looking for the jumper / dipswitch the label of that switch can be anything; however, in most cases will be labeled CLEAR - CLEAR CMOS - CLR - CLRPWD - PASSWD - PASSWORD - PWD.
  • On the computer motherboard locate and remove the CMOS battery for at least 10 minutes allowing the computer to lose its information. Note: this will not work on all computers.
  • If your manufacturer has a bypass password this can be entered and allow you access to the BIOS and/or computer. Because of the security risk of a bypass password, generally only older computers will have this option. In addition, it is likely that this information will only be able to be obtained from the computer, motherboard or BIOS manufacturer.
  • On the computer motherboard locate the CMOS solder beads and jump the solder beads to clear the password. The identification and location of these solder beads can vary and if not available in computer documentation is generally only obtainable through the computer manufacturer.
If one of the above solutions do not clear the password or you are unable to locate the jumpers or solder beads, it is recommended you contact the computer manufacturer or motherboard manufacturer for the steps on clearing the computer password.

Good Luck, this should get ya back on line/Please dont for get to Vote.Thank You.

Dec 15, 2007 | HP OmniBook XE3 Notebook

Not finding what you are looking for?

322 people viewed this tip

Ask a Question

Usually answered in minutes!

Top Computers & Internet Experts

Doctor PC
Doctor PC

Level 3 Expert

7733 Answers

kakima

Level 3 Expert

102366 Answers

David Payne
David Payne

Level 3 Expert

14161 Answers

Are you a Computer and Internet Expert? Answer questions, earn points and help others

Answer questions

Loading...