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cmos checksum bad


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#1 tom34nl

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Posted 20 January 2010 - 03:31 PM

Hello all,
i hope someone can help, here is the what happened and what i have tried :
my sons pc we made a fresh windows install,and everything was good except a small prob with a sound driver.
i left him to try and find a compatible driver, he found what appeared to be the good driver but on installation he agreed to an option " destroy checksum " .
thereafter he received the following errors.

on boot up

floppy control fail (i have never had a floppy drive in that pc)
cmos checksum bad
cmos date and time not set
press f1 to run setup.


when the pc boots the lights on keyboard flash on and off,
i get to the errors, i try to press f1 but nothing.
the pc dosnt recognise that there is a keyboard.
the keyboard is good as i am using it now on my pc to type this.
it is a ps2 keyboard not usb.

i assume the the cmos has lost the plot so i have taken out the battery and also tried moving the jumper to reset everything (no power cable attached).

neither of these have helped, i cannot enter the bios setup as the keyboard isnt recognised.

motherboard type :
p4 m800 pro m2 rev 2.0

bios(i think) ambios 686

your suggestions are most welcome as i am now beginning to bang my head against the wall :-)
:thumbsup:
Thanks

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#2 MrBruce1959

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Posted 20 January 2010 - 03:48 PM

My first impression is that he did not have an audio driver.

He either ran a BIOS flash/BIOS eraser program, that erased the firmware from the motherboards BIOS chip.

This is really dangerous to do within windows in the first place.

It may have been a fake driver. Not sure where he got the so-called driver from, so i can't varify this. But a check-sum error is caused when the BIOS chip is flashed and not set to default.

I'll leave it at that until more is posted.

There may be a way to do an emergency reflash of the chip, if not, then you need to get another BIOS chip for the motherboard.

http://www.esupport.com can help with a new chip if needed.

Edited by MrBruce1959, 20 January 2010 - 03:54 PM.

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#3 tom34nl

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Posted 20 January 2010 - 03:58 PM

Thanks mr bruce ill also keep my eye on this post with fingers crossed :-)

#4 tom34nl

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Posted 20 January 2010 - 04:24 PM

Ok after some more questions bout the driver he downloaded i found out he mistakenly downloaded a bios flash program and deleted the bios i think.
The file he downloaded was at the following adres :


http://drivers.softpedia.com/progDownload/...load-16439.html


I dont know too much about bios flashing and so on, does anyone know of a simple guide?
How do i know which is the correct bios for this setup?
will the pc read the floppy drive before anything else? (basically will i be able to get around the problem of no keyboard?)
Thanks.

Edited by tom34nl, 20 January 2010 - 04:26 PM.


#5 MrBruce1959

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Posted 20 January 2010 - 11:17 PM

Yes that was a BIOS flash utility.

If even if you wanted to Flash your motherboards BIOS chip, it is never done while running windows.
It is most often done in DOS mode, booting from either a floppy disket or a bootable cdrom.

I have seen many posts made on message boards where a BIOS flash failed, rendering the motherboard unbootable.

My suggestion is to use the link I posted above and try to order a new BIOS chip.
A while back I did a bad bios flash and I got a new chip from them and was very happy with the service and the pc booted like new!

Yours is most likely un-flashable/un-repairable, because even the "possible" recovery features were lost once you rebooted the machine.

As for a BIOS the correct AMIBIOS BIOS firmware would be at this web site http://www.ami.com which is now useless since you can no longer boot to a floppy.

Good luck.

Edited by MrBruce1959, 21 January 2010 - 12:02 AM.

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#6 tom34nl

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Posted 21 January 2010 - 04:22 PM

HI
Thanks again for your input, i will do as suggested and look towards getting a new bios chip.

#7 garmanma

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Posted 21 January 2010 - 09:04 PM

try to order a new BIOS chip.


As long as yous is the removable type
http://www.biosman.com/
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#8 MrBruce1959

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Posted 21 January 2010 - 10:49 PM

try to order a new BIOS chip.


As long as yous is the removable type
http://www.biosman.com/



Good site! Thanks for sharing that link, I'll bookmark it for sure.
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#9 tom34nl

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Posted 15 February 2010 - 01:56 PM

Thanks all for your replies,
Problem solved, it was the bios that got messed up.
I ordered a new bios chip and hey presto were back on..]
:thumbsup:

#10 MrBruce1959

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Posted 15 February 2010 - 03:51 PM

Thanks all for your replies,
Problem solved, it was the bios that got messed up.
I ordered a new bios chip and hey presto were back on..]
:thumbsup:


Welcome back! Glad every thing is okay now!

New lesson learned, be careful what you install on your computer. Read all documentation first before installing. :flowers:
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