GA-7N400 Pro2 - CMOS + reset loop problem

oakland600

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Dec 10, 2006
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Hi there,

Hope someone can help…..

First problem I had related to the PSU not working properly. The PC kept cutting out on start-up, it was only after pressing the start button/re-set button several times that the PC managed to finally get to the desktop. This problem has got worse and a few days ago during the usual dozen or so attempts at trying to get it started I noticed an error on the first start-up screen (the one where it does the memory check). The error message was:-

“CMOS checksum error – defaults loaded
F1 to continue. Del to enter setup/Dual Bios, F9 for xpress recovery

08/02/2004 nvidia-nforce-6A61BG0MC-00”

I took the F1 option and it got as far as the windows logo appearing with the scrolling progress bar. The pc then did a re-set by itself but this time there was no cmos error message. However it again did the re-set at the windows logo. So it seemed to be caught in some kind of re-set loop. I switched it off at the PSU as this was the only way I could power it down.

The next day I couldn’t get it to power-up at all. The PSU had packed in I guess.

I replaced the PSU with another and on start-up it went into the re-set loop again.

After a bit of research I replaced the cmos battery from my other PC and tried it again. This time the old CMOS error appeared but this time when I took the F1 option it loaded up windows without any problem. However the processor speed is not appearing correct in the device manager, but I think I know how to fix this in the BIOS/mobo. Unfortunately when I now re-start the PC it goes back into the re-set loop. The only way I can get the PC to boot ok is by taking out the CMOS battery and putting it back in. This only works once and after a re-boot I need to do it again.
I am actually using the pc now to post this, and it’s been working ok for about an hour, but I know if I re-start I will get the re-set loop problem.

Can anyone offer any advice?
Thanks in advance.

Ian
 

DukeDave

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Nov 23, 2006
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I have not had this particular fault but it did sound to me like the cmos battery was flat and it wasn't holding it's settings.

I wonder, have you loaded setup defaults in the bios before loading windows, everytime you remove the battery it will forget the previous settings, I am not sure what it loads up in it's place.
 

oakland600

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Dec 10, 2006
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Hi DukeDave,

Thanks for your reply.

You're right - when the battery is taken out, the system restores the default bios settings.

When I get the checksum error I can go into the bios and reset the values to what they should be, but when I do this and re-boot the pc goes into the soft re-set loop.
The only way I can get to the desktop is by hitting F1 when I get the checksum error - and this loads the default settings. What's strange is that when I do a re-boot after reaching the desktop, it goes back into the reset loop even though the default settings have been set.

Anyway thanks for your feedback.
Ian
 

Alyarbank

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Jul 12, 2006
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Try putting a new battery in. If the CMOS battery is dead it cant hold settings, so when you either power off or reboot your restarting the (loop).

They're cheap and easy to get try Radio shack or something.
 

oakland600

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Dec 10, 2006
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Hi Alyarbank,

Thanks for your reply.

I should have said before that I've already tried a new battery and it didn't make any difference.

Thanks for your feedback.

Regards.

Ian