If it can locate the HDD, please save the setting first. If one of your voltage rails from the PSU is bad, it can wipe CMOS memory contents. Get a hardware monitor and let it run to watch voltage ranges. The tracings on the mainboard can definately short/ground or have periodic shorts causing the cmos memory to become corrupt.

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But how do you know how long the battery has been in service? The next time you replace a coin cell, note the date on a little piece of masking tape and stick it on the bottom of your inner PC case. Things get a bit more complicated without boot block recovery, because this means you need to replace the entire BIOS chip. Unfortunately, you must send the motherboard back to the manufacturer for repair.

Bona fide computer geeks may simply find it easier to replace the motherboard outright. I updated my BIOS, but my idiot brother rebooted the system in the middle of everything, and now the PC won’t boot. A lithium coin cell fits into a small holder on the motherboard. Although this should keep a tight grip on the battery, rough battery replacements can bend the terminals and loosen the battery. Oxides and dust can eventually make the battery contact questionable. I updated my BIOS and need to clear the CMOS RAM, but my motherboard lacks the proper jumper. Although personal computers have a long-standing reputation as precision timepieces , they often lose time over a matter of months.

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Whenever you start your computer and it asks you to press F1 and reset the date and time. Regardlessly that you turned off your computer in the correct manner. This message will continue to pop-up whenever you start your computer. This is due to some battery issues or a dead battery. Do not power down the system during the BIOS update process.

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This error can also be caused by incorrect BIOS settings, which could be related to new devices that you have added. If the cause is dead battery, all you need to do is replace the battery. CMOS batteries are located on the computer motherboard. On the desktop, it is very easy to take out the battery . On a laptop, you will need to turn on the device to find the motherboard and preferably have a professional help. A sudden increase in voltage and power failure is another possible cause of this error. Increasing the voltage can also cause hardware damage.

The chip itself, mainboard tracings or circuitry leading to it could go bad or be defective. Is it because information between the 2 HD’s are conflicting with the old motherboard settings and the new one, or am I missing something? Confirm that the Battery LED indicates that the battery is charging . Ideally, CMOS backup batteries can maintain CMOS RAM contents for years.

As the battery drains, time starts to slip, and it gets worse just before the battery fails. Replace the CMOS backup battery and reset your clock. The CMOS RAM draws so little current that it often retains data for hours once you remove the battery. This makes it easy to pop out the old battery and insert the new one with very little chance of CMOS RAM data loss. But once the battery fails and CMOS contents disappear, you need to reload the default values . I replaced my CMOS backup battery just a few months ago, but I still see occasional CMOS battery errors.

(Basic Input/Output System) is a motherboard chip that stores the instructions needed to boot your PC and transfer control to the operating system. This is often called firmware because the BIOS instructions are recorded on the chip itself.

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