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Windows 7: Main BIOS checksum error !

12 Jul 2013   #1

Windows 7 Ultimate x64
 
 
Main BIOS checksum error !

My pc is showing " main bios checksum error " , it even does not start in one time i have to push on button 4 to 5 times the it starts . What to do ?


My System SpecsSystem Spec
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12 Jul 2013   #2

Windows 7 ultimate x64
 
 

Hey Shukla, Try removing the CMOS battery and keep it out for 30+ mins and then insert it back. Try this first and let us know.
My System SpecsSystem Spec
12 Jul 2013   #3

Windows 7 Ultimate x64
 
 

I have done that but nothing happens .
My System SpecsSystem Spec
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12 Jul 2013   #4

Windows 7 ultimate x64
 
 

It seems like you tried to update the BIOS and it did not go well. If yes, Try this.

Unplug the power from PSU. Take out the CMOS battery and all unnecessary peripherals (Take out anything your PC doesn't need to boot. This includes card readers etc.). Unplug all the HDDs. Run the PC on just one RAM stick (if you have multiple RAM sticks). Only keep your keyboard plugged in.

Wait for BIOS to reset, put the battery back. Boot the machine, then go to BIOS settings, run Q-FLASH. Update the BIOS to latest version. Disable "LOAD CMOS DEFAULT".

Plug in all the devices back and then check.
My System SpecsSystem Spec
12 Jul 2013   #5

Windows 7 Ultimate x64
 
 

no , i never tried to update bios .
My System SpecsSystem Spec
12 Jul 2013   #6

Win 7 Pro 64-bit 7601
 
 

then bios corrupted on its own. need to update the BIOS for your motherboard.
My System SpecsSystem Spec
12 Jul 2013   #7

Windows 7 ultimate x64
 
 

As already mentioned above. BIOS is corrupted. If possible get updated BIOS file for your motherboard and update it with the steps mentioned.
My System SpecsSystem Spec
12 Jul 2013   #8

Windows 7 Ultimate x64
 
 

I have updated the latest bios version ( from version F1 to version F3 ) on my motherboard with the help of @BIOS utility tool. Thanks for helping.!
My System SpecsSystem Spec
13 Jul 2013   #9

Windows 7 Ultimate x64
 
 

it again showed that message
My System SpecsSystem Spec
13 Jul 2013   #10

Win 7 Pro 64-bit 7601
 
 

Then it could be drained CMOS battery or dying PSU.

Or at least in other such cases I had the culprit was that. I hope others have better ideas.
My System SpecsSystem Spec
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 Main BIOS checksum error !




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