Have taken the motherboard out and checked if anything loose/touching where it shouldn’t be. Everything fine – including the screws for mounting the board onto the posts, they touch where they should on the metal rings only. I can’t see any obvious drain on the cmos battery which is what i guess must be happening.

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if it soilder on you can buy a replacment chip on ebay and see if a local tv/computer shop can unsoilder and do a chip replacment. I turned it on yesterday and it loops between the attached error and asking me to go into the BIOS. After some research I have reset the CMOS shell32.dll is missing from your computer, loaded default settings in the BIOS, as well as change the battery on the motherboard . Just a clarification CMOS and cmos battery are not the same. CMOS is a circuitry design/chip while cmos battery powers the cmos so that it can retain whatever data the cmos holds even when for example a PC is turned off. When you get the "CMOS checksum error" it cannot see the wireless keyboard, and you can’t then get to the bios set-up. always have your old hardwire version handy in the closet.

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Have changed the battery again and will see how it goes, just in case the previous ones were doa. Ok checked CLR_CMOS header and it looks fine – nothing touching the two wires, its open. Its a GA-K8NXP-Sli board and there is no jumper as standard. The problem persists – the CMOS checksum error came up again and the defalts were loaded. One of my counter parts has been having problems a CMOS checksum error with his CMA4000 OTDR . The problem manifests itself once the on board battery begins to fail. Reinstall the CMOS backup battery, reconnect the motherboard power cable, and turn on the system.

Now, you’ve already seen that the checksum error was being reported. Not you, or anyone, can tell if the part of the invalid code is in the timing loop to check the clock pulses, or anywhere else. If the code is bad then you really can’t trust anything to work properly. It may just be coincidence if your computer boots up at all. Then I had a checksum error, and the cpu does not load beyond BIOS. Occasionally, he would give me access to the XP splash screen, but it will freeze once a single bar flies through the screen. if the error still there look online see if the bios chip is removable on your mb or it soilder on.

Whenever you change BIOS settings, start your computer or shutdown, those events are written to CMOS. CMOS keeps track of those things to make sure everything runs normally the next time you start your computer. The CMOS is still on while the rest of the computer is turned off because it is powered independently by the watch battery. When the computer starts, it tries to read the final state from CMOS. Normally, it can read information and restore itself without problems.

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  • User Dismissal – Requires the user to close the notification.
  • If the ‘Status’ column says "Running", right-click the Windows Update entry and click ‘Stop’.
  • Scroll down the list until you reach the Windows Update entry.
  • Right-click the top result and select ‘Run as administrator’.
  • Set the active hours to prevent the system from rebooting during these hours.

If you see a “CMOS Checksum” error, load the default settings (see the earlier annoyance “CMOS Checksum Causes Concern”). The CMOS checksum error is an issue that affects many users of different versions of Windows, and it often occurs anywhere. This issue can occur during the BIOS boot screen, and your computer will be prevented from loading the operating system.

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