Cannot set cmos default values

Hello.
Hopefully someone may be able to shed some light on a problem that I am trying to resolve.

I recently was given an old HP Pavilion laptop (N3295) that had been sitting unused for years.
I have a planned home project that utilize this old computer. On this particular unit, the CMOS
battery had died and thus the CMOS was corrupt. However, the Bios (and User) passwords were
being requested even though none had ever been set by the original owner (co-worker friend).
I am also not able to boot the computer to an OS from any media. So... I stripped the unit and removed
the CMOS battery (bottom of motherboard - very hard to get to). With no battery, I rebooted and
noticed that the system detected a cmos checksum error (as expected) and restored default values. However,
this still did not resolve the problem.

Well, somehow, during my testing I *did* manage to get past the Bios password and was able to
get into the bios setup. I noticed that many if not most of the configurable items in the Bios setup
are grey'd out and are not configurable. Again, I decided to force the computer to reinstall the
default values and once again, I'm locked out with the password request.


It seems to me that the CMOS ram is NOT being reconfigured to the default values as claimed.
Does this imply bad CMOS memory? The RTC/CMOS is located in the National PC87570 Keyboard controller.
I find it hard to believe the CMOS ram is bad but that is what I am thinking. Does anyone have any thoughts
as to how and resolve this issue?

The way I see it, there really is NO password stored but the CMOS ram *thinks* that there is due to a
mis-configured bios bit.
Am I way off here? Sorry for the long drawn out explanation..

Any help is appreciated. Thanks
Jim
1 answer Last reply
More about cannot cmos default values
  1. It just dawned on me.. where are the DEFAULT CMOS values retained? Would these be hard coded
    in the BIOS? The reason I ask is that I found a small 256 byte serial eeprom that has me
    wondering. My guess is that this eeprom gets loaded at the factory with the default values.
    I read back the data from the serial eeprom and saw what I thought was some configuration
    data. So, what is the possibility that this eeprom has become corrupted and it is these
    corrupted default values that are getting loaded when I reset the CMOS?

    Again, your thoughts?


    rfdes said:
    Hello.
    Hopefully someone may be able to shed some light on a problem that I am trying to resolve.

    I recently was given an old HP Pavilion laptop (N3295) that had been sitting unused for years.
    I have a planned home project that utilize this old computer. On this particular unit, the CMOS
    battery had died and thus the CMOS was corrupt. However, the Bios (and User) passwords were
    being requested even though none had ever been set by the original owner (co-worker friend).
    I am also not able to boot the computer to an OS from any media. So... I stripped the unit and removed
    the CMOS battery (bottom of motherboard - very hard to get to). With no battery, I rebooted and
    noticed that the system detected a cmos checksum error (as expected) and restored default values. However,
    this still did not resolve the problem.

    Well, somehow, during my testing I *did* manage to get past the Bios password and was able to
    get into the bios setup. I noticed that many if not most of the configurable items in the Bios setup
    are grey'd out and are not configurable. Again, I decided to force the computer to reinstall the
    default values and once again, I'm locked out with the password request.


    It seems to me that the CMOS ram is NOT being reconfigured to the default values as claimed.
    Does this imply bad CMOS memory? The RTC/CMOS is located in the National PC87570 Keyboard controller.
    I find it hard to believe the CMOS ram is bad but that is what I am thinking. Does anyone have any thoughts
    as to how and resolve this issue?

    The way I see it, there really is NO password stored but the CMOS ram *thinks* that there is due to a
    mis-configured bios bit.
    Am I way off here? Sorry for the long drawn out explanation..

    Any help is appreciated. Thanks
    Jim
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