Most laptops have a sticker or label on the bottom panel displaying the serial number (S/N).
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On some older laptops, the serial number can be found under the battery. Remove the battery to check.
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Restart the laptop and enter the BIOS/UEFI by pressing a key like F2, F10, or DEL during boot-up. The serial number is often listed under system information.
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Open Command Prompt (CMD) and type wmic bios get serialnumber, then press Enter. The serial number will be displayed.
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Press Windows + R, type msinfo32, and hit Enter. In the System Summary, the serial number might be listed as “System Serial Number.”
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On a Mac, open Terminal and type system_profiler SPHardwareDataType. The serial number will appear under “Hardware Overview.”
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Click the Apple logo in the top-left corner, select "About This Mac," and the serial number will be displayed on the Overview tab.
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Some brands allow you to check your serial number by logging into your account or entering product details on their support website.
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If the sticker is missing, some laptops have the serial number printed on the motherboard, which can be accessed by opening the laptop case (not recommended unless you are familiar with hardware).
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Some laptop brands, like Lenovo or HP, provide software utilities that display system information, including the serial number.