Follow the below steps:

  • Navigate to the “Start” menu and select “Run.” In the Run dialog, type “cmd” (without quotes) and click “OK.” The Command Prompt dialog opens.
  • Type “wmic bios get serialnumber” (without quotes). Press “Enter.” The computer responds with information from the Dell remote computer. The information below “Serial Number” is the Dell system service tag.
  • To obtain the make and model number, type “wmic csproduct get vendor,name,identifyingnumber” (without quotes). Press “Enter.”