Clearing the CMOS starts by restoring the BIOS settings to factory default. Most carrying cases allow you to clear the CMOS in the BIOS menu. In many cases, you may need to open the computer case again.
On Windows, CMOS stands for Complementary Metal-Oxide Semiconductor. This is the battery-backed memory that resides on your computer’s motherboard. The term also describes a storage technology that helps your PC’s Basic Input/Output System (BIOS) device store important configuration data, such as alternate dates and times. Boot order, disk information, and other system configurations.
If you’re having memory issues, your PC will display a “CMOS Checksum Bad” error before booting into Windows. In this guide, we will show you what contributes to the error and how to fix it.
Restart your laptop or computer. A normal reboot usually creates a new checksum and fixes the biggest error.
Download and flash the BIOS update. Download the update from the motherboard manufacturer’s website.
Replace CMOS battery.
Contact a repair shop or computer repair specialist Rev.
“Checksum” describes a unique value (number or letter) used to control or verify the integrity of files on a storage device. Get the CMOS Checksum Bad error on your PC when the values are only corrupted in the CMOS memory. This may be due to installing an incorrect or corrupted BIOS update. The CMOS itself is powered by this special battery. In addition, you may receive a control error.Full CMOS amount if the CMOS battery is low, defective, or old.
Power surges or improper unplugging of the computer can also cause a CMOS checksum error. Despite many causal relationships, “Invalid CMOS Checksum” is easy to fix. Done:
The funny CMOS is often referred to as Real Time Clock (RTC), COS-MOS (Complementary Metal Oxide Semiconductor Symmetry) or Non-Volatile Random Access Memory (NVRAM).
You can usually start your computer without a CMOS battery if your default CMOS settings are compatible with the operating system, or if you manually set the correct CMOS settings after every power off.
If your Windows PC displays an “Invalid CMOS Checksum” error during startup, the troubleshooting solutions listed below should resolve the issue. A
Startup Repair can also be used to cmosgeek.com issues that prevent Windows from starting normally. Turn off your computer and follow the options below. your
If Windows doesn’t finish loading, put your computer on the floor and turn it on with your lower back. When the backlight turns on, press F8 or F11 repeatedly until the extended boot range appears on the screen.
Another way to load the advanced boot menu is to restart the computer in different sequences. That is, on some PCs, immediately press and hold the power button until your PC shuts down. Repeat this three times and some PCs should load the advanced boot menu on the third try.
This tool will diagnose your computer and attempt to fix system errors that prevent it from starting normally. Restart your computer after completing each process and verify that the checksums are correctCMOS.
Performing a hard BIOS reset will erase all saved information for CMOS. Incidentally, a decent process will also remove corrupted data and invalid BIOS values. Access to the BIOS and factory reset depends on the motherboard and PC brand.
For more tips, see our guide to factory reset directly from the BIOS in Windows. Be sure to immediately restart your computer and reset your BIOS settings. This will restore your current checksum values and fix the CMOS error.
Press F1 or F2 on our error page to go to the BIOS introduction page and select Load Defaults, Load Set Defaults, or any other very important option to restore BIOS defaults.
Some computers may require a different media cover (usually the Del key on the other side of F8) to enter the Windows BIOS setup page. Check the instructions on the error page to be sure.
If you left the page in error Hey, you can reset your BIOS settings in the Windows Advanced Boot menu. Turn on your computer and wait 20-30 seconds until it shuts down completely.
The BIOS setup graphical user interface varies depending on the brand of your PC. However, you should find some kind of BIOS reset option in the general output section of the BIOS utility.
If you can’t find a way to restore your BIOS settings to default, contact your PC manufacturer or refer to your device’s user manual.
which resets the individual PC’s BIOS settings to their defaults and also boots Windows. To confirm why the issue has been resolved, turn off your computer and turn it back on. Try the following troubleshooting step to fix the actual event where you always get the “Invalid CMOS Checksum” error when your PC crashes.
You perform a BIOS update when your PC’s BIOS performance does not match the latest plan on the manufacturer’s website (see the appropriate Driver Download or BIOS section). Download the BIOS utility, which has an item suitable for your PC model, working with administrator rights, and why the utility does not automatically update the BIOS of one device.
Before you realize your current BIOS is a sensitive component connected to your PC motherboard. Installing a Full Update, Update, or BIOS May cause permanent damage to the system board. Follow your PC manufacturer’s instructions carefully so you don’t throw your device in the trash. says
We strongly recommend that you only download BIOS files from your PC manufacturer’s website. Also make sure that the BIOS update applies to your PC model. If you install another device’s BIOS file on your computer, its motherboard will be locked.
Finally, you should not shut down or wake up the computer while the BIOS is expanding. Any interruptions (e.g. power surges, possible power failure) during operation may be rejected by the BIOS or motherboard.
As mentioned earlier, if the battery powering the CMOS is dead, your computer cannot authenticate BIOS files, the Internet, etc.
If clients still receive a CMOS checksum error after applying these troubleshooting improvements, the CMOS battery may be of poor quality. Or maybe it was moved from that position.
Try adjustingReplace or replace the CMOS battery only if you are an experienced computer technician. Otherwise, visit your local repair center and contact your PC manufacturer.
Partial or total damage to your PC or motherboard can also cause this particular “CMOS Checksum Bad” error. Take someone’s computer with you to a repair center to check the motherboard for damage.
Turn off your computer.
Unplug your computer from the electrical outlet.
Press the power button several times to refresh all capacitors.
Locate the CMOS battery on the motherboard.
Carefully remove the CMOS battery.
Wait a few minutes, the CMOS battery can be replaced.