A serial number is a unique numeric sequence that helps keep track of items. All computers come with serial numbers. These serial numbers may become necessary when calling technical support to get help with your computer. Serial numbers are visually displayed on desktop and laptops with a sticker. The sticker can usually be easily located in the rear or underneath the device. Some computer manufacturers, like Gateway, can also link into your computer and find your serial number for you.
Power your computer off, so you can have access to the rear or underside of the computer.
Pull your hard drive case out, on a desktop, so you can locate the serial number on its side or on its back. If you have a laptop, turn it over.
Locate any stickers on your computer. Many computers will have more than one sticker containing a series of numbers or other information.
Find the sticker that says Serial Number or S/N. The serial number will be following those words or letters.
Go to Gateway's website at gateway.com if you have a Gateway computer, and they will find your serial number for you.