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Need to bypass/clear the Compaq Presario 1200 bios password

My friend just gave me a Compaq Presario 1200 notebook and when I tried to boot it, it asked me for the bios password. No matter what I do, so I can't neither boot in windows nor get into the bios. My friend doesn't know it too. What should I do to bypass or clear it, please?

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  • grech_kevin Jul 30, 2009

    Well, this model series is old. The battery (if it has, i can't seem to find it) is a goner (doesn't charge, always empty) and the case's screws are TORX type. I also tried phoenix bios backdoor passwords. They didn't help :(

  • grech_kevin Jul 31, 2009

    Sorry but i can't open the case. It has torx screws :S

  • grech_kevin Aug 01, 2009

    Hmm, thanks for the help guys. I managed to reset the password :D



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Try removing the main battery, then open the case. Under the keyboard and close to the CMOS chip, you may find a reset buttom or jumper. Alternativelly, you may remove its small round-shape battery for half an hour or so. This would return CMOS features to default. Fix power supply again and restart, normally the BIOS should stop asking for a password

Posted on Jul 30, 2009

  • Randy Hough
    Randy Hough Jul 30, 2009

    The cmos battery is under the keyboard on the motherboard.There is also a jumper that will have the same effect

  • Randy Hough
    Randy Hough Jul 31, 2009

    You can buy a set of torx tools for a couple of dollars.


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I have recently fixed my Compaq presario 1215 laptop by replacing the CMOS battery (CR1220 in my case). Before that, it kept asking me a password on boot after showing many BIOS related errors. After three password attempts it gave me the 65535 hash code. Removing the battery for 5min did not help. Putting a new battery did.
For my laptop I have to remove the 3 bottom screws on the front. Then open the laptop and carefully pry out the speaker-touchpad cover (it has a cable, so do not pull to much). Then you can flip over the keyboard (it also has a flat cable, do not pull too much). At this point I place masking tape to hold them in place.
Where the keyboard was, you can see a metal plate with 3 screws. Remove the screws and pry out the plate (it is a bit tough, for it has a sort sticky surface that makes contact with processor.
Now you see the internals. Towards the rear there is a small print board that has two connectors. A small one on the left that can stay in place. A big one that connects it to the main print board. Use a small plastic stick or equivalent to pry it up on the right side. Then flip it to the side.
The CMOS battery is completely at the rear, under the attachment of the screen. Use flashlight to locate it. Pry it out (it has a plastic U-cover that will come off as well).
To place the new battery, I placed two small masking tape portions on its side so that my fine tweezers can have a good grip to place it in its lodging. Then use small plastic stick to push it in place. The same with the plastic U-cover. Put everything back. If you have accidentlally removed the 2 flat cables from keyboard and touchpad, then push them back in before placing back the metal plate.
Presto, your 20 year old laptop should work again and let you go into BIOS settings without password.

Posted on Dec 20, 2015

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Press the F-Keys at boot up also try taking the ram out then the hard drive and check for an error code this should help if not i would consider a reformat or repair with a XP or Vista CD

Posted on Jul 30, 2009

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Please go to the site I link you to below. Go down the page a ways, neglect all the advertisement stuff and look for a little single line link to Download "Hiren's Boot CD 11.0" on another computer.

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Some BIOS manufacturers implement a backdoor password.
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You can try using this to Reset / Remove this BIOS Password >

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