Check the sticker on the PC case, back panel, or bottom panel
Open Command Prompt and run: `wmic bios get serialnumber`
Open PowerShell and run: `Get-CimInstance Win32_BIOS | Select-Object SerialNumber`
Open System Information and look for BIOS Version/Date or System SKU details
Check BIOS/UEFI setup during startup for the serial number
Use the manufacturer’s support app or utility
Check the original box, receipt, or warranty documents
Log in to the manufacturer’s website and view registered devices
Check the device label in Windows Settings under About if provided by the manufacturer