You Have to Remove RTC battery ( Cmos ) battery. Wait approximately 5 minutes Replace the RTC battery and reassemble the computer Connect Ac Power to the computer. Do not reinsert any batteries at this time Turn On the computer
all the passwords and all the cmos setting have be cleared.
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I am afraid there is no way still to retrieve BIOS password but you may want to contact HP Support to check if they have ways to check that for you. Usually for the case you have it is replace MOBO already. Please check the number on the link below base on your location.
The Power on Password is set from the BIOS configuration. Ask that person who borrowed your Compaq for the password. Once you have this password, you can enter the BIOS configuration and remove/disable this password.
Depending how old you Compaq is, removing the BIOS battery and main battery for 15+ mins may remove this password and restore the BIOS to the factory default (insert both batteries again) and configure the BIOS Date and Time etc.
BUT if the the password is stored on an EEPROM chip then removing will not fix this problem. There are no backdoor passwords available.
here are 2 password type first 1 is bios password if tell me about your bios password it prompt when u powerup follow procedure below
For that you need to reset factory defaults settings for bios. For reset bios u have to open back side of your laptop then u find motherbord circuit there. pull cmos cell on motherbord for 15 minute then it reset to defaults. Also u can reset with jumper settigns read carefully on mother bord there is 1 jumper near cmos cell u read there " bios reset or clear" It is on 1-2 position right now set it in 2-3 position then power up then all bios settings are reset. then again set it in 1-2 its original position. Then it not want password.
And if u tell about windows password Then when you power up the computer press F8 key then enter in safe mode then wait until it prompt for user passsword
then enter in administrator then if u able to enter then reset your password. But if u set and forgot default administrator password then u should need winxp recovery disk. Please rate me . Thanks .
remove the laptop battery and the plug to your bios (small) battery on the motherboard wait about ten minutes then plug the bios battery back in power the computer back up using the power supply not the battery then: shutdown and, reboot again after you have reinserted your laptop (large) battery; you should have all passwords removed.
Ok, as long as the high security level has not been set in the bios then the following will work to reset / disable the bios password.
1. Remove the battery and mains adapter.
2. Remove the memory cover on the back of the laptop and remove the 2 keyboard screws.
3. Open the laptop and at the top of the keyboard you will see 4 sliding tabs. They are located between the 'Esc & F1 keys' 'F4 & F5 keys' 'F8 & F9 keys' and 'F12 & delete keys'. Slide these down and lift the keyboard up and pull forward slightly so as to disengauge the bottom lugs. Be carefull as there is a ribbon cable at the bottom that does not need to be tugged or removed.
4. You will now see at the bottom behind the keyboard a small battery connected to the motherboard. Gently pull the small white plug upwards untill it is removed from the board.
5. Wait 5 minutes and re-connect the small battery plug.
6. Re-install the keyboard and push back the clips. You do not need to replace the screws yet.
7. Apply the DC jack and power on - DO NOT INSTALL THE MAIN BATTERY.
8. Turn the laptop on while pressing f10 repeatedly but slowly - Do not hold it.
9. If high security is disabled you should now be in the setup screen, select 'Restore Defaults' and press F10 to save.
10. The password is now removed.
If this does not work then HP say that there is no other way to reset it. Im not sure about that, there probably is by some method of de-soldering the bios chip. However the above method worked for me so I hope it does for you. Please rate if you have any luck.