Find proof of purchase: find the proof of purchase, such as receipt, invoice or warranty certificate, that you obtained when you bought the computer. These files usually contain information about the purchase date and warranty period.
Check the warranty terms: read the warranty terms and conditions of the computer. Warranty terms can be found in the user manual, warranty card, manufacturer's official website or product packaging box of the computer. Learn about the warranty period, coverage and other information that may be needed.
Consult the manufacturer or after-sales service: If you can't find the purchase certificate or warranty terms, it is recommended to contact the computer manufacturer or its after-sales service center directly. Provide the serial number or other identification information of their computers, and they can check the relevant records and tell you the warranty status of their computers.
Online registration or verification: Some manufacturers require you to register or verify online after purchase to activate the warranty service. If you have completed the registration or verification process, please log on to the manufacturer's official website and look for information about the warranty status.