omen 25l cmos checksum error no boot

[sentientpear]

On power up my daughter got a Bios/Cmos checksum error and then immediate power off. Now the computer won't even respond to the power button. Have tried the "troubleshooting" recommended by the HP Virtual Assistant and nothing. The last computer that i had this happen to, it was the cmos battery. But I do not know where on the motherboard the cmos battery is.

[Alden4]

Hi @sentientpear,

Welcome to HP Support Community.  

Thank you for posting your query, I will be glad to help you.

The CMOS checksum error you're experiencing could indeed be related to the CMOS battery. The CMOS battery is responsible for providing power to the CMOS (Complementary Metal-Oxide-Semiconductor) memory, which stores the BIOS settings, including the system clock.

Here are the general steps to locate and replace the CMOS battery.

Identify the Motherboard Model:

• Try to find your motherboard's model number. You can usually find this information printed on the motherboard itself or in the documentation that came with your computer.

Locate the CMOS Battery:

• The CMOS battery is typically a coin-cell battery (CR2032) and is usually located somewhere on the motherboard. It's a small, silver, coin-shaped battery.

Power Off and Unplug:

• Before doing anything inside the computer, make sure it's powered off, and you've unplugged it from the electrical outlet.

Open the Computer Case:

• Depending on your computer model, you may need to open the case to access the motherboard. Consult your computer's manual for instructions on how to do this.

Locate the CMOS Battery:

• Once the case is open, look for the CMOS battery on the motherboard. It's often near the edge, but the exact location can vary.

Replace the CMOS Battery:

• Carefully remove the old CMOS battery. Take note of its orientation, and replace it with a new one of the same type. Make sure the new battery is correctly oriented.

Close the Case and Power On:

• Close the computer case, plug in the power, and turn on the computer. The BIOS settings may have been reset, so you might need to enter the BIOS and configure any necessary settings.

If, after replacing the CMOS battery, the issue persists, there might be a more significant problem with the motherboard or other components.

I hope this helps. 
 

Take care and have a good day.

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Alden4
HP Support