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Pins 1-2 once shorted will clear NVRAM and reset all ESCD Settings This is another method that can be used to reset the BIOS on the system by simply removing the CMOS coin cell battery and then clearing power from the system.

This is commonly done if you cannot access the jumpers or if you are dealing with a laptop system.

Once the jumpers are correctly set and power is supplied this will then reset the BIOS on the system. The NVRAM will be cleared when the jumper is closed (use the jumper from the password bridge (PSWD)).

To properly clear; AC power must be applied (not necessarily turned on) to the system for about 10 seconds while the jumper is closed.

The information stored in the BIOS (Basic Input/Output System), known as ESCD (Extended System Configuration Data) can occasionally become corrupted due to a variety of situations such as power events, incorrect settings by the user, hardware incompatibility due to a specific setting, or a No POST or No Video scenario.

In these cases it is sometimes necessary to reset the BIOS or CMOS (Complementary metal–oxide–semiconductor) to "Factory Defaults", or in other circumstances, clear the NVRAM (Non-Volatile Random Access Memory) Caution: Be careful when altering BIOS settings.

Unfortunately, access to computers can, at times, be blocked for all of the wrong reasons.

Portable systems however will require a door on the bottom or perhaps keyboard removal to access the coin cell battery.Reversing this can be time consuming as well as very frustrating depending upon the motherboard manufacturer and the make and model of the motherboard.Relax though, as it is possible to reset or disable the password.Resetting from Within BIOSResetting the Jumper Removing the CMOS Battery Community Q&A Have you recently made a change to your computer's hardware and need to reset your BIOS? Are you locked out of a computer that you purchased secondhand because of an unknown BIOS password? If so, you'll need to reset your BIOS to factory settings. Press the key to enter the BIOS, usually Del, F1, F2, or F10. The duration for a complete loss of data could differs between some seconds, hours, or several days. BIOS-Info BIOS Beeps BIOS Chip installation - removal BIOS Chip package types BIOS Chip Type list BIOS Error messages BIOS FAQs BIOS IDBIOS Passwords CMOS-Reset How to find the type, manufacturer and version BIOS-Software BIOS Boot-CD BIOS Boot-Diskette BIOS Boot-USB-Stick BIOS Boot-Logo BIOS Software-Tools About me Advertising on biosflash Business terms (german)Cancellation policy (german)Contact Feedback Impressum Links to biosflash Privacy policy (german)References Search There are of course other situations, but the above are by far the most common reasons to make a CMOS reset. These instructions describe only in general, how to erase the CMOS on PC-Mainboards and Notebooks. The CMOS will lost its data when removing the voltage/battery (CMOS-Battery, see picture).Your only chance is to contact the support of your notebook manufacturer.Depending on the manufacturer, you have to send him the serial number of the notebook and you'll get (in many cases free of charge) an individual master password to unlock the notebook.


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