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Upon boot up, the computer may read a “CMOS checksum error,” or date and time keep getting reset. If this is the error you are receiving you should replace your CMOS Battery.

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  1. Press the battery release tab and the battery will pop up.
    • Press the battery release tab and the battery will pop up.

  2. Remove the battery from the laptop, it will come out easily.
    • Remove the battery from the laptop, it will come out easily.

  3. Remove the single screw holding the accessory plate.  This is a PH0 2.0x2.5 screw. Remove the single screw holding the accessory plate.  This is a PH0 2.0x2.5 screw.
    • Remove the single screw holding the accessory plate. This is a PH0 2.0x2.5 screw.

  4. Pry the accessory plate up from the back of the laptop by applying force upwards where the screw was removed. Pry the accessory plate up from the back of the laptop by applying force upwards where the screw was removed. Pry the accessory plate up from the back of the laptop by applying force upwards where the screw was removed.
    • Pry the accessory plate up from the back of the laptop by applying force upwards where the screw was removed.

  5. Remove the screw from the wireless adapter with a PH0 screwdriver then move the adapter out of the way to access the CMOS battery. Remove the screw from the wireless adapter with a PH0 screwdriver then move the adapter out of the way to access the CMOS battery. Remove the screw from the wireless adapter with a PH0 screwdriver then move the adapter out of the way to access the CMOS battery.
    • Remove the screw from the wireless adapter with a PH0 screwdriver then move the adapter out of the way to access the CMOS battery.

  6. Use a plastic or metal spudger to release the CMOS battery from the clips.
    • Use a plastic or metal spudger to release the CMOS battery from the clips.

  7. Remove the battery from the device. Remove the battery from the device.
    • Remove the battery from the device.

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To reassemble your device, follow these instructions in reverse order.

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Robert Patterson

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