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I took out the cmos battery yestaday but stil the bios is lockd the laptop name is lenovo g40-30 please any one help me

How do i reset bios passwod on it the cmos battery is out from yestaday please i ned help

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Please help me : :' my pc is lenovo g500 and i forgot password bios who help me please


I do google your problem and look to the lenovo G500 manual.
here's the manual says.


BIOS password problems I forgot my password. • If you forget your user password, you must ask the system administrator to reset your user password. • If you forget your HDD password, a Lenovo authorized servicer cannot reset your password or recover data from the hard disk. You must take your computer to a Lenovo authorized servicer or a marketing representative to have the hard disk drive replaced. Proof of purchase is required, and a fee will be charged for parts and service. • If you forget your administrator password, a Lenovo authorized servicer cannot reset your password. You must take your computer to a Lenovo authorized servicer or a marketing representative to have the system board replaced. Proof of purchase is required, and a fee will be charged for parts and service.

But in my own way of troubleshooting.
1. open your Lenovo G500
2. Check your motherboard and look for bios/cmos battery.
3. Remove the battery
4. Get flat screw driver then put it between two pins where the cmos battery attached.
5. Hold it for 10 to 15 sec.
6. Put the cmos battery back and the motherboard
7. Power it up and holla the bios setting has been reset to default.

Here the sample image of Lenovo G500 motherboard


Jun 11, 2015 | Lenovo Computers & Internet

2 Answers

My bios is lockd

Near the button cell backup battery, which is probably a CR series,
there is normally a reset jumper, which shorts the NV ram. This will factory reset the bios. Or you can remove the battery for a while. If it is an AMI bios, type in AMI for the password.

Apr 15, 2014 | Lenovo Computers & Internet

1 Answer

Lenovo 3000 n200 bad bios flash

You can try removing the CMOS battery for a few hours. Did the BIOS update come from Lenovo website? What was the reason for the BIOS update, a problem? Altering the BIOS or the System Registry is like taking a stroll in a minefield, one wrong step and............well you know. Take a look at this forum:

Jan 11, 2013 | Lenovo 3000 N200 Notebook

1 Answer

I have a toshiba laptop SPM30, I need to bypass the bios passwod to use the uni, help!!

I believe if you remove the cmos battery for a period of time it will reset it.

Oct 09, 2012 | Toshiba Computers & Internet

1 Answer

I still need help to find diagrams to show me how to remove the cmos battery please :-)

Generally, CMOS batteries on MOST current portables is not removable, why are you wanting to remove it? If you are trying to reset a HDD or BIOS password, removing the battery will not resolve.
Service Manual is here:

Jun 25, 2011 | Lenovo 3000 N100 Notebook

2 Answers


Hi, the standard reset solution for laptops is to remove AC power and battery then hold down the power button for one minute to clear the memorys. In my experience this only works for a limited number of laptops. The alternative is to open up the laptop and remove the cmos battery overnight which works in most cases. If this is a modern IBM and reading between the lines you are asking this question in order to clear a bios password then neither method is likely to work, worth a try anyways tho.

Hope this helps


Dec 01, 2010 | Lenovo ThinkPad Z61t PC Notebook

4 Answers

I lost my bios password on a s10e netbook. does someone know how to fix it ? The user password is OK, but not the administrator.

If you're really sure that it's the BIOS password, you can reset that by resetting the CMOS battery in the laptop. You can reset the CMOS battery by removing it and placing it back again. You can ask a local technician how to do this.

Dec 25, 2009 | Lenovo IdeaPad S10e Netbook

1 Answer

Where is the Bios Battery in a Lenovo 3000 N200?? Please please please, my f... Laptop doesn´t work anymore!! Thanks a lot...

Just some troubleshooting suggestions:

1. Try starting it using the "Lenovo Care" button (the one with the orange wrench above it.
2. Reset the BIOS CMOS (there is a tiny CLRP1 spot under the RAM)
3. Try to start it without any RAM or HD.

Hope this helps.

Jul 09, 2009 | Computers & Internet

2 Answers

Lenovo master password forgotten

i own one too, and only way to fix that is to reset the BIOS, i mean is the battery removal.

Dec 19, 2008 | Lenovo 3000 C200 Notebook

2 Answers

How to reset bios password FOR LENOVO 3000 LAPTOP

You can reset BIOS password by removing CMOS battery from motherboard and re insert again...

Dec 10, 2008 | Lenovo 3000 C200 Notebook

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