In rare cases, we may need the serial number of your laptop or monitor. You can find the serial number on a sticker on the back of the device, for example.
Below you can see how to find the brand-dependent serial number and how it is structured:
Dell: https://www.dell.com/support/contents/en-uk/article/product-support/self-support-knowledgebase/locate-service-tag/notebook?lwp=rt (Dell service tag: at least five-digit alphanumeric identifier that uniquely identifies your product).
Lenovo: On the sticker, the serial number always starts with S/N and is usually ten digits long (numbers and letters).
HP: https://support.hp.com/gb-en/document/ish_2039298-1862169-16 (usually starts with SN/ CN.)
Apple: https://support.apple.com/en-gb/102858 (Serial number with 12 alphanumeric values.)