Question about Compaq Evo Notebook N400c

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Power up pasword

Just purchased a compaq n400c can u tell me how i change the power up password as i dont have a manual , i do know the current password , just want to change it , thanks

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Re: power up pasword

The windows log on password can be deleted by:- press F8 on start up and enter safe mode and highlight start windows in safe mode, and log in windows using administrator account and go to user accounts and profiles and in the other log on account delete the password and restart windows. If you mean the bios password only removing the cmos disc shaped battery on the motherboard for 5 minutes or so can delete the password.

Posted on May 05, 2007

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I had installed a bios password on my Compaq Evo N400c, which i have forgotten, i need to make my CD as 1st boot device so need to reset its Bios password.

I found this fix for your problem on

If you have lost your BIOS password(s), then you can clear them by removing all power from your laptop for a while.

I think you are familiar with how to enter the BIOS - but if not - look here:

You may need to consult the Maintenance & Service Guide for your N400C to find and remove the RTC battery. You can access that and all the documentation for your notebook here:

This is the procedure to clear the Set-up (BIOS) passwords:
(1) turn off the computer.
(2) If it was in a docking bay, remove it.
(3) Disconnect A/C Adapter.
(4) Remove main battery pack (and the secondary battery if one is fitted.
(5) Disconnect the Real Time Clock (RTC) battery from the system board. (You'll need to remove the palm rest and keyboard to do this - there are clear instructions and pictures in the Mtce & Svce guide referenced above. You should see a tiny white plug on the end of the RTC coin cell leads. Disconnect it - you do not need to remove the RTC battery.)
(6) Now wait 30 minutes. (The 5 minutes quoted by HP in some of its manuals is not enough)
(7) Press and hold down the laptop power button for 1 minute. (This is intended to clear any stray voltages or static that's still around)
(8) Reconnect Real Time Clock battery and re-assemble laptop. (BUT DO NOT re-fit the main battery yet.)
(9) Hook up the A/C adapter and turn on the laptop. System should boot up OK - press F1 or F10 while on Compaq splash screen (ie before windows starts to load) to access BIOS.
(10) All passwords should now be cleared. Check you can enter BIOS OK. It should be restored to Compaq default settings with no power-on or admin passwords.
(11) Now you can re-insert the main battery (and secondary battery if you have one)
(12) Now reset date, time and other BIOS settings as you want them to be.
(13) If you set any passwords - make sure you keep a note of them somewhere safe but outside the laptop !!!!

Hope this helps

Mar 31, 2011 | Compaq Evo Notebook N400c

1 Answer

I canot clear setup password cmos on laptop compaq evo n400c

compaq website,,driver downloads and support,,,,they will have a answer for u

Nov 03, 2010 | Compaq Evo Notebook N400c

1 Answer

Need to delete power on password on presiaro r3000

If you know the current password, enter it, and then click "change password".

If you do not know the current password, you could be a thief, in possession of a stolen computer. Find the original sales-receipt, and telephone COMPAQ. Once they identify you as the owner, they can tell you how to delete the password.

Jul 20, 2010 | Compaq Presario R3000 Notebook

1 Answer

I have a compaq evo n400c pc and when i switch it on it always asks for the power-on password which i do not have because i have forgotten it. how can i restart the pc and create a new password so i can...

Try booting up into safe mode and changing the account's password or deleting the account. If it is a BIOS password, then you will have to contact the manufacturer.

Dec 13, 2009 | HP Compaq Evo n400c Notebook

1 Answer

I need an instruction manual for HP/Compaq Evo N400c

hello there:
yes the manual can be downloaded the manufactures website ie just make sure that you find the right manual for your model

Jul 29, 2009 | HP Compaq Evo Notebook N400c

6 Answers

Upgrading memory on my Compaq Evo N400C notepad

i have the same Compaq Evo N400c its a ram under the keyboard check there to upgrade it i got Compaq Evo N400c 1gb ram

Dec 30, 2008 | Compaq Evo Notebook N400c

3 Answers

I have a compaq evo n400c needs a power on password key

If you forgot your password then you have to take your laptop to hp service centre. Because the laptop need to be disassembled before one can reset the poweron password.

Nov 23, 2008 | Compaq Evo Notebook N400c

2 Answers

Power up pasword

Change the power up password in the bios.

The nc6220, is this a power up password issue also, or something else?

Aug 09, 2008 | PC Laptops

1 Answer

Evo n400c

Did you charge it for up to 8 hours?

Caring for your Compaq Evo N400c Laptop Battery You can improve the life of your Compaq Evo N400c Laptop Battery by doing the following:
When you first receive your laptop battery charge it fully for at least 6-8 hours and then discharge the battery fully by using your laptop unplugged from the mains until it runs down completely.

Repeat this 3 times to ensure your Compaq Evo N400c Laptop Battery will give you the maximum performance.

If you regularly use your Compaq Evo N400c Laptop on mains power for extended periods, removing the battery from your Laptop during these periods will extend the usable life of your laptop battery.

Apr 05, 2008 | Compaq Evo N400C Notebook

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