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.
.com/blogger_img_proxy/          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.