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cmos checksum error

by sk_tan_sg / March 25, 2008 12:36 PM PDT

I am using this Lenovo PC for some 2 years now. The specs are as follows:
Intel Celeron CPU
Speed 2.66 GHZ
Ram 1.27 GB
Bios Type Phoenix-Award V6.00PG
Bios Updated on 11/10/06
Bios ID Grantsdale 6a 79DFKJC-00

At times when I boot up the pc, I would hear 2 beeps and ?CMOS Checksum Error? appears. Then I have to press F1 and reset the date/time and press F10 when I am done. The PC then boots up normally. The next time when I boot up again after switching on the power, the same thing happens. The date goes back to 1/1/2003 and time is 0:0:0. I have to reset this again.
I have tried changing to a new CPU battery but the problem still remains. I have not install any new hardware expect increasing the ram by another 1GB. I have also tried removing the new ram card and conducted an anti-virus scan. Problem still not solved. And the thing that frustrates me is that this happens intermittently.
I have not try the jumpers yet, cause i do not know how or where the jumpers are. Is it necessary to do so? What would be the pros and cons to adjust the jumpers?
Thanks and pls HELP!!!!

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Just sharing
by R. Proffitt Forum moderator / March 25, 2008 10:53 PM PDT
In reply to: cmos checksum error

Other causes I've found for this issue.

1. Type "bad caps" at
2. I fixed a few by putting in a new power supply.

There is some CMOS RESET or PWD RESET jumpers on boards, which I will not write at length about. I use those to reset the CMOS values and then setup the values again. Rarely fixes the issue.

Worse case issue? The motherboard has failed in some odd way.

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replace power supply unit
by sk_tan_sg / March 26, 2008 3:35 PM PDT
In reply to: Just sharing

Hi Bob,
Thanks for the advise. I have tried replacing the power supply box but now the PC just wouldn't boot up. The HDD LED light just kept on flashing but nothing happened. So i hooked back the old power supply box and back to my old problem (CMOS Checksum Error). I have also did an "eye-ball" check on the CAPs like you said, all seems ok. No bulgging or leaking caps.
Any suggestions with regards to the power box replacement?

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The most common issue with power supplies is
by R. Proffitt Forum moderator / March 26, 2008 10:18 PM PDT

Missing a connection. Many owners don't change them often and can't get the connections on proper. Others will omit an ATX12V connection.

Sadly if a new CMOS battery doesn't cure it and you measured that battery with a volt meter to be sure it's good then the board looks to have failed.

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Thanks Robert
by sk_tan_sg / March 27, 2008 2:37 AM PDT

Ya Bob I thick the mobo has failed me. Well that goes to show that Lenovo has failed me too. Just less then 2 years usage. My other older Acer is already 5 years and my son is still happily playing his online games and does his homework on it.
Well i guess i will get a new CPU and this time i will make sure its not a Lenovo.
Thanks Bod for all your quick responds by the way i think this forum is cool. Cheers

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