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I forgot my BIOS password on my Sony VGN A790, I haven't used it in awhile. I can't get in. Any answers?

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  • petereal30 Mar 16, 2011

    Taking out the cmos battery did not fix it. Only having a master password will work



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Posted on Mar 16, 2011

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  • Sahil Uppal Mar 16, 2011

    You entered a password into the BIOS setup program to control access to the system, and then forgot the password. If this a setup password, you will be unable to enter the BIOS setup program. If this is a startup or boot password, you will be unable to boot the system at all.

    For most people, using the BIOS passwords isn't a great idea, and this is the main reason why. If you do use a password, you should always record it in writing somewhere in case you need it later on. It can be hard to get around this sort of a problem, precisely because if there were an easy way to get around the password, it would have no value. In most cases you will have to clear the CMOS memory to erase the password.


    If you haven't already, and if you can live without the machine for a day or so, wait and try to remember the password. This is the best solution, if you can remember it. :^)
    If your system has an AMI BIOS, try the default password, which is either "AMI" or "ami". This will not usually work, but is worth a try.
    If you cannot get into the BIOS program, your only remaining option is to try to clear the CMOS memory that holds BIOS settings. Included in this memory is the password, so this will let you get back into the PC. See here for instructions on erasing the CMOS memory.
    If it is a setup password that you are trying to get around, then you can at least boot the PC. It is possible in some systems that performing a flash BIOS upgrade will clear the CMOS memory and eliminate the password. I would not recommend trying this without getting confirmation from your motherboard vendor first, as doing flash BIOS upgrades in strange situations can theoretically be dangerous.

  • Sahil Uppal Mar 16, 2011

    This is how you reset the CMOS
    Turn off the PC. Hold down the {Insert} key and then turn the PC on and wait for it to boot. On some PCs, this will clear and reset the CMOS memory for you. (On most PCs it will not work, so don't be discouraged.)
    Try the same thing with the {Delete} key. Again, it usually won't work.
    Look in your motherboard or system documentation for any evidence of a CMOS clear jumper. This is a jumper on the motherboard that can be used to clear the CMOS memory; many newer motherboards have them. Follow the instructions for its use as described in the documentation; usually this means opening the PC, changing the jumper to a special setting, and then booting the PC. The CMOS memory will be cleared. Then you power the PC down and put the jumper back to its previous position. If it doesn't work properly when you try it, look here.
    If you do not have a CMOS clear jumper, your next option is to try disconnecting the CMOS battery. This is easy to do if the battery on the motherboard is removable or user-replaceable. If you see on the motherboard what looks like a flat round wristwatch or calculator battery in a holder, that's it. Some older motherboards use batteries that sit off the motherboard and connect with a wire. If the battery can be disconnected, then disconnect or remove it. Wait for about two hours (you may need to vary the amount of time; if two hours isn't enough, try leaving it overnight) and then plug it back in, and the CMOS should be cleared and reset.
    On some systems, the CMOS battery is integrated within the BIOS chip. You may have success with removing the chip for a few minutes and then replacing it. Just be very careful to take anti-static precautions.
    Your motherboard may have a battery that is soldered to the motherboard. You may not see a battery on the motherboard at all; if this is the case then your motherboard probably uses a battery that is integrated into the real-time clock chip (or else, you weren't looking closely enough :^) ). Unfortunately, on a motherboard without a removable battery and with no CMOS clear jumper, clearing the CMOS memory is difficult to do. At this point you should contact your manufacturer for technical support.

  • Sahil Uppal Mar 16, 2011

    can you tell us what's the serial number of you computer. May be we can arrange that for you as it can be generated through serial number only.



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