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If you are not the one who set up the Bios password, your options are to keep guessing or reset the cmos.
To reset the cmos, open your laptop and look for a small, silver, circular battery. Make sure everything is unplugged and remove the battery. Then, simply place the battery back into the computer. This should reset the bios and allow you to access it.
Resetting the BIOS password for a laptop can be difficult. A typical way to reset the BIOS password is to remove the CMOS battery from inside the computer. By removing the CMOS battery, a small battery inside the computer that looks like a watch battery...it should clear out the password. Often times with a laptop though, the CMOS battery might not be easily accessible.
I have done this before by unscrewing the bottom or back of the laptop, and then looking for the battery. You remove the battery for lets say 5 minutes, and let the laptop sit. Then carefully put the battery back in, and reboot the laptop, and see if BIOS password is gone.
I would recommend letting someone from a local PC repair place try this, as it can be a delicate procedure. Otherwise you need to follow up directly with Dell and probably send it off to them.
Alternately, you could try and take main the battery out of the laptop to try and reset it. I'm not sure though this would clear a BIOS password.
Hope this helps.
There are a few ways. The easiest way is to enter the BIOS setup screen, and select the option to reset to default settings, it should be easy to find or it would be on the save changes sections.
If you can not access the BIOS setup screen, it will take physical access to the computer's motherboard. This means you will need to open up the computer case. From here there are a few options that you can do.
change the the CMOS jumper to reset. Press the CMOS reset buttion Or remove the CMOS battery for a few minutes. Please note that not all manufacturer have a jumper setting or cmos reset button. Also a CMOS battery looks like a button battery. Also if you are going to open up the case, make sure the computer is off, unplugged, and if this is a laptop the battery must be removed.
To remove the bios password you need to clear the CMOS. Open your laptop casing look at your motherboard. locate the CMOS jamper it is near the battery. To clear remove the jamper and turn your computer on with in 5 to 10 seconds and turn it off. Reinsert the jamper back to there proper place and try to turn go to BIOS if there will be a password box appear.
You need to open your laptop and look at the motherboard and locate the CMOS battery. Just remove it with in 5 minutes to clear BIOS password.
unlock the bios password on your laptop, you will need to remove the
cmos battery on your laptop for some minutes and insert back, the cmos
battery is located on the motherboard of your laptop, once the cmos
battery is removed from the motherboard for some minutes, the bios
password will be reset, and that fix the problem.
All you need to do is just to power off your system, remove the battery and unscrew all the screws that will lead you to your board.
When you are at the board, remove the cmos battery of your laptop and put back your laptop battery to power on the laptop for a while, power on without the cmos battery, your laptop will be reset and will not ask of the bios password anymore.
After it has been reset, you can now put back the cmos battery and couple everything back.
Your laptop will work without asking you bios password anymore.
The best way for the Sony is to remove the cmos battery for at least 30 minutes. Remove the main laptop battery and leave it out. Make sure the power adapter is not attached. The cmos battery can be reached after removing the keyboard and is attached to the motherboard vis a small cable. If you have a "jumper" that come equipped on hard drives to jump the pins on the back, you can "short" the pin connections on the cmos battery socket, power the laptop up using the ac adapter and letting the computer go through the bootup process. When this happens power the laptop back down, take the jumper off and replace the cmos battery. Power back on with just the ac adapter and boot the computer. If the laptop still askes for a bios password just hit enter and it should allow you to log in. Once in go into the bios and reset the date and time. Once that is done power down and replace the main battery. Reboot the laptop and let Windows load.
At his time you need to open the back cover of you laptop to solve the
problem. You need to reset the CMOS battery of jamper to clear BIOS
password. To open the back cover you need to remove first the laptop
battery after that fine and remove some screw. Once you have
already remove the screw and the cover you can see there a small circle
CMOS battery you need to remove is to clear all stored password in CMOS
memory. You can also see there a jamper near the CMOS battery just
remove that and turn on your laptop with in 10 seconds and turn off.
Reinsert the jamper with the same position. Now the CMOS password are already clear just turn on your laptop first before you close the cover.
To replace the CMOS battery you should first go into the BIOS and write down the settings so that you can reset them afterwords.
Now unplug any sources of power from your computer (as the picture is of a laptop im going to assume its a laptops CMOS battery you are changing) So make sure to take the regular battery out aswell
Now you must locate the CMOS battery on the motherboard. (it looks like a large watch battery)
Get a new battery of the exact same specs as the battery you removed.
Put the new battery in. Turn on the computer and enter the BIOS. Reset all of the settings and you are good to go :)
There are lots of tools/software available to reset bios password. Just
google for "reset bios password" and you will find one of them, else
just open your back side of your notebook. Open the screws and remove
the bios battery (a circular shaped sitll battery). If possible change
the battery with a new one or keep that battery out of laptop for some
time. Now start notebook without the battery and shut down.Then
reinsert the battery to laptop and start again. The password should be
resetted by this process.