Article: Either use the Start menu to shut down, or press and hold your computer's power button until the computer shuts down. If you're using a desktop computer, you can usually turn the CPU entirely off by pressing a switch on the back of the CPU box. This includes power cables for desktop computers and charging cables for laptops. If you're using a laptop (or a desktop with a backup battery), remove the battery before continuing. before continuing. Touch a nonpainted metal surface to get rid of any static electricity before you start taking apart your computer. Touching the motherboard or other internal computer components while not properly grounded can permanently damage your computer. You will need to be able to access the motherboard of your computer. Be very careful when working on the inside of your computer, as electrostatic discharge can easily destroy sensitive components. For many laptops, you can access the CMOS battery from a removable panel on the bottom of the laptop. If there is no panel available, you will most likely need to disassemble the laptop to access it. The battery is typically located near your PCI slots, but may be in different locations depending on the manufacturer of your motherboard. It may be hidden by expansion cards and cables. The battery is usually a standard 3V, round, flat watch battery (CR2032). Press and hold the power button on your computer for about 10-15 seconds to discharge any remaining power stored in the capacitors. By discharging the power, the CMOS memory will reset, thereby resetting your BIOS. Carefully reinsert the CMOS battery back into its housing. Make sure that you have put the battery in the right direction. The slightly smaller side should be facing down. Do so carefully, and remember to ground yourself periodically. If you unplugged the computer from the wall and/or removed the battery, plug it back in and/or replace the battery. Depending on your computer, you may have to access the BIOS and reconfigure some of the options, including the default boot option or the date and time.
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Power down your computer. Unplug your computer from any power sources. Remove your computer's battery if necessary. Discharge any static electricity Open your case. Remove the CMOS battery. Press your power button. Reinsert the CMOS battery. Reassemble your computer. Reconnect your computer's power source(s). Turn back on your computer.