A Step-By-Step Guide to Restore Slow Laptop Speed After System Upgrades

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CMOS checksum error happens during system startup, the issue is between the CMOS and the Bios. After you switch off your computer, CMOS keeps record of the number that can blend with another that the BIOS produce during Startup. So if the number the two Value generates did not match it leads to checksum error. However, whenever I change the time and date to the correct one, I will get this CMOS checksum invalid error when I start up my computer.

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See, most desktop motherboards have a small battery that supplies power to the BIOS even when the machine is turned off. If this happens, you need to switch on your computer and leave it on for a day. If the computer is not showing the errors after rebooting, the CMOS battery is charging. Please make a different selection, or visit the product homepage. You can just see it on the motherboard in the picture on page 29 of the manual just above the hard drive. The problem now is that when I want to extract the bios.

Above, you can see the " CMOS checksum error – Defaults loaded " and at the bottom with guiding line " Press F1 to continue, DEL to enter SETUP " . Go back into the bios and check the settings for your Harddrive, and boot settings. The primary IDE channel is where older PCs normally expect to find a boot disk. Check the cable between your motherboard and harddisk. Has it been inserted correctly and in the right orientation? Also check that the jumper settings on the boot disk are set to ‘master’. I tried by re-installing the jumper in the motherboard.

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Since im using desktop with intel it makes computer laggy and ill have to restart it. Thank you for the drivers, I am not sure whats wrong with my work pc that I couldnt locate drivers myself and was unable to start bios update utility. If the battery is dead you will get the same problem every time you turn your computer off, as it is non-volatile RAM. It needs power you see, which a dead battery will not be giving it – mains power is not the same thing here. The default settings will sort this problem out and you have the fix you need if the batter y is not dead. Nevertheless, the simplest solution is to buy a new battery – we are talking pennies. The cmos battery keeps the information in BIOS from being lost when the power is off on the computer.

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If you remove the battery, the BIOS will be reset to default. This is a small battery on the motherboard that gives power to the CMOS when you turn off the computer power supply. The battery makes sure the Bios loads the accurate settings to enable PC start up normally.

I am still getting the same message while booting each time. does the cmos battery on the motherboard need replaced? it is normally a cr-series (cr-2032. cr-2016, etc) and the cost a few bucks at walmart. In most other cases, you just need to reset the BIOS. Some motherboards have a switch on the motherboard itself or on the back of the computer to reset the BIOS settings. Without such a switch, you can remove the CMOS battery from the system in a minute or two.

How to Fix a CMOS Checksum Error

The CMOS memory loss due to battery failure may cause a more serious problem. In such case the system will display an error message .

When the CMOS memory fails due to any technical issues , the BI OS does not get the data required during the booting process. In such cases the booting fails flashing an error message. The CMOS is placed on the motherboard generally next to ROMBIOS Chip . The CMOS is a battery powered semiconductor chip inside computer that stores the information needed during the computer booting process. Fortunately, this sounds like a pretty easy problem to fix. I don’t think the driver-update utility is to blame here, but rather a poorly timed CMOS-battery failure.

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