Lenovo ThinkCentre A51 Quick Reference Manual page 34

The machine type, model, and serial number are labeled on your computer.
Use the following table to record this information.
Product name
Machine type and model
Serial number (S/N)
Date of purchase
Register your computer over the Internet when you first visit the IBM Web
site. When you register your computer, you will receive the following benefits:
v Faster service when you call for help
v Automatic notification of free software and special promotional offers
Go to http://www.ibm.com/pc/register/ and follow the on-screen
instructions. See Access IBM for more information on how to register your
computer.
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Quick Reference
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