You’ve got a problem with your computer, you call their technical support team and the person on the other side requires the machine’s serial number (also known as the Service Tag) before he can even log your request.
The serial number is a unique identifier number consisting of the character string, numeric digits or/and typographic symbols assigned to PC or laptops by original equipment manufacturer. A serial number of laptop helps the manufacturers in providing technical support service or warranty. The serial number will only show in the command prompt if the OEM saved it to your PC's BIOS or UEFI firmware. If the OEM didn't, or this is a self built PC, then you may see To be filled by O.E.M in the command prompt instead.
If you using a laptop computer, you can easily find the service tag by turning the machine upside but for desktops, especially the older models, the sticker that holds the service tag is often placed at a more harder-to-reach location.
There’s a alternate way to find the computer’s serial number without you having to slide beneath the table.
Open the command prompt (Start – > CMD) and type the following command:
Another command that will also print the model number (or make) of your computer is:
The system model number can also be found using the System Information program available under All Programs – > Accessories – > System Tools.
Find My Pc Serial Number
The above commands should work on Windows 7, XP and Windows XP Pro machine as wmic.exe didn’t ship with the previous editions of Windows. Refer to this page to learn about all other system details that you can retrieve with the help of wmic.exe command.