Cmos checksum error - default loaded

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leroys1000

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Make sure the clear cmos jumper on the motherboard is
set to the run or normal position,not the clear position.
 

dettro

Thread Starter
Joined
Apr 11, 2009
Messages
66
hi thanks for the response...

I have not changed or in fact even touched these settings in the first place, when i logged in one day my computer clock was reset to manufacture date, then i thought it was a battery issue and replaced the battery (only) then i restarted and set the correct time and switched off the pc and switched it on again, but the system time got reset again , this is when i realised that something else was wrong (and not the CMOS battery).

Today after i read ur thread I thought to clear CMOS by short circuiting the jumper pins (using a metal object for five seconds) . I did that and set the bios to load optimised defaults... stil same issue.... the battery is new as well.... my motherboard is the model shown below (http://www.gigabyte.com/search/search.aspx?kw=GA-G31M-ES2L+%28rev.+2.x%29)

GA-G31M-ES2L

I also did a bios update not knowing exactly what needs to be done,

please advice
Thanks again
Dettro
 

crjdriver

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Joined
Jan 2, 2001
Messages
43,636
A checksum error is generated when the bios does not "See" the hardware it expects to see. It can be caused by a number of things;
1 Unsupported cpu
2 Failing cmos battery OR the battery does not fit correctly in the holder. Dirty contacts on the battery holder, etc
3 Failing components on the mb

Since it has been running and you have not changed any hardware, I would tend to think it is either reason 2 or 3.

Get a bright light and carefully check the contacts in the battery holder. While you have the system open, check the mb itself for any leaking capacitors. If you find any that look like the pics below, you have found your problem.
 

Attachments

Joined
Oct 4, 2011
Messages
27
Hi there, don't know if you've checked this already, but hm...hope you have inserted the battery right..I mean the "+" has to point to a specific direction which is marked on the battery holder on the motherboard.
 
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