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Windows 7: CMOS bad checksum error - defaults loaded... ?


29 Oct 2010   #1

Microsoft Windows 7 Home Premium SP1 64-bit Build 7600 / Microsoft Windows XP Professional SP3
 
 
CMOS bad checksum error - defaults loaded... ?

Hi there people!

Again, abusing you with some doubts... basically, I replced my old CR2032 MoBo battery in my desktop with a new one, 4-5 weeks ago, more or less, the old one was dying (date not being displayed correctly)... but recently, 2 days ago, I had a power down (light went off... god damm CFE) and then a fast light return-off... fortunately, I use a regulator, so if it doesn't get enough power to enable power on for my devices, they won't turn on...

After that, 2 days after, I'm getting this nasty error when loading my PC... saying that CMOS checksum is bad, default configurations are loaded... also says something about the processor speed incorrect, but that is corrected when "defaults loaded", at least I suppose that.

I need to be sure that my MoBo is not dying (PLS NOOOO!!! ) My devices are recognized properly and I don't get any OS problems so far...

Thanks in advance for your help people

See ya!!!


My System SpecsSystem Spec
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29 Oct 2010   #2
ryo

 
 

hello..
when you startup, is it display that's your cmos checksum is bad.
try to check your battery,anyway default of the battery for PC is 3V. least of the 3V the battery is bad.
but if you get the battery is 3V, so try to put up and put in again to reset the bios. and then startup again, set up the date/time. see what you get.
My System SpecsSystem Spec
29 Oct 2010   #3

Microsoft Windows 7 Home Premium SP1 64-bit Build 7600 / Microsoft Windows XP Professional SP3
 
 

I'll try that... anyway... how do I know thet the batt is 3V? sorry for asking this dumb question XD.

See ya!!
My System SpecsSystem Spec
.


29 Oct 2010   #4
ryo

 
 

you can use the multitester for see how volt is it.
My System SpecsSystem Spec
30 Oct 2010   #5

Microsoft Windows 7 Home Premium SP1 64-bit Build 7600 / Microsoft Windows XP Professional SP3
 
 

Unfortunately, I don't have such tool (shame of me ), It's weird that the battery could be bad since it's new (energizer)... by now I did soe stuff... I resseted my config to the fail-safe options, then booted in windows, then I shuttd down and unplugged the CPU cable and left that way for 1 hour (that is the time supposed to loose any configuration in BIOS, maybe less) rebooted and by now, no message, then configured as always, and did the same... no issues, I used the desktop and then I shutted down again, I will leave it as I always do (conneted to the regulator, but this last and the multiplug off) and see if by tomorrow I get the same issue...

I hope it's finally fixed

See ya!!!
My System SpecsSystem Spec
30 Oct 2010   #6

 
 

1 thing to try is to access the BIOS, set all you need to, then save & exit. I've had this a few times where if the CMOS checksum is bad it just needs the BIOS saving which will/should get rid of the error.


OS
My System SpecsSystem Spec
30 Oct 2010   #7

Microsoft Community Contributor Award Recipient

Windows 7 64 Bit Home Premium SP1
 
 

I'm with Orbital Shark. His method may work and is quick and easy.

But if that doesn't work you could go further and try these:

1. If your BIOS has a "Reset BIOS Defaults" option:
  • Note all your current BIOS settings
  • Go into BIOS and choose "Reset BIOS Defaults" > Save & Exit
  • Immediately go back into BIOS and reset all your preferred settings > Save & Exit.
2. You may need to reset the processor clock. This is done by performing a CLRTC on a desktop.
  • Note all your current BIOS settings
  • Shut down the computer > remove the power cord.
  • Remove the 3v battery.
  • Move the CLRTC jumper from pins 1-2 to 2-3.
  • Touch a metal part of the case and Press and Hold the reset button for approx. 30 seconds to discharge all power from the board.
  • Put the CLRTC jumper back on 1-2.
  • Replace the battery > replace the power cord > boot.
  • Immediately go back into BIOS and reset all your preferred settings. If the CLRTC worked you will need to reset the date and time.
(CLRTC is an ASUS protocol, but most motherboard use the same procedure - just call it something different!)

Hope that helps.
My System SpecsSystem Spec
30 Oct 2010   #8

Microsoft Windows 7 Home Premium SP1 64-bit Build 7600 / Microsoft Windows XP Professional SP3
 
 

I have no reset button... but the power button will do, right?
My System SpecsSystem Spec
30 Oct 2010   #9

Microsoft Windows 7 Home Premium SP1 64-bit Build 7600 / Microsoft Windows XP Professional SP3
 
 

OK... did what you said, I had to reconfigure clock and my other settings, I got no error message so far... I hope this continues this way until Monday (my system will be shutted down until that day because I have "long weekend")

When I shut down my system, I also shut down the regulator, and then a multicontact stck I have, with this setting, it gets no power at all from the wall... it's like if I leave my CPU unplugged when I don't use it... I had no issues with this before... this is not causing this errors right?

Also I cheked the battery with a friend, it has full charge, so is not the battery...

I hope thjis advices finally fixed my issues

See ya!!!
My System SpecsSystem Spec
30 Oct 2010   #10
ryo

 
 

basically if the cpu.. at the mobo that's have the jumper to reset the bios.
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and attached http://static.circuitcity.com/pdf/PC..._v3_Manual.pdf
manually we can set the reset bios from there by clicking the jumper.
after that, it's will prompt you to manually set up the date/time and after configure it, save the setting.
hope this help.


My System SpecsSystem Spec
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 CMOS bad checksum error - defaults loaded... ?




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