How do I fix a bad CMOS checksum?

How to Fix CMOS Checksum Errors

1. Restart the computer. A normal restart usually creates a new checksum and eliminates the error.
2. Download and flash a BIOS update. Download the update from the motherboard manufacturer’s website.
3. Reset the BIOS.
4. Replace the CMOS battery.
5. Consult a technician or computer repair expert.

What is a CMOS checksum?

The CMOS checksum error is essentially a conflict between the CMOS and the BIOS that happens when you boot your PC. When you shut down your PC the CMOS records a number that must match another that the BIOS generates when you start up the computer again.

What does CMOS checksum invalid mean?

CMOS checksum error is caused when the CMOS values are incorrect or corrupted. This issue can occur because of: – Bad or old CMOS battery: Reboot the computer. If the error still occurs after rebooting, enter CMOS setup and check all values, this includes verifying that the time and date are correct.

How do I fix main BIOS checksum error?

Remove the power supply cable to the PC and remove the CMOS battery for at least one hour. If the problem persists then re-flash BIOS with F7 using the QFlash utility. Make sure that you disable the “Keep DMI Data” option on the QFlash homescreen before you actually run the update.

What causes CMOS checksum to make a bad error?

Causes of CMOS Checksum Bad Error. There are usually three main reasons that a CMOS Checksum Bad Error occurs. They include: 1. CMOS Battery may not be functioning properly. The battery life may have expired. (it’s probably this) 2. The user or a virus may have updated the BIOS.

Is there a way to fix a BIOS checksum error?

As to the OP’s problem, maybe clearing cmos through a jumper on the motherboard might resolve the checksum error. If this doesn’t help, maybe reprogramming the BIOS through BIOS update will do the trick.

What’s the difference between CMOS and BIOS checksum?

CMOS is a circuitry design/chip while cmos battery (mostly CR2032 on computers) powers the cmos so that it can retain whatever data the cmos holds even when for example a PC (with the BIOS configuration) is turned off. As to the OP’s problem, maybe clearing cmos through a jumper on the motherboard might resolve the checksum error.

Is the CMOS reset ( 502 ) Error message invalid?

This HP All-in-One is only a couple of months old. Brand new, just out of the box it displayed the CMOS checksum is invalid. CMOS Reset (502) error message, but then restarted and seemed to operate normally, unless it lost all power.

https://www.youtube.com/watch?v=4_ft4FpOQ1w