If the screen on your TV is flickering, the first thing to do is determine what the cause is. We can do this with some simple testing.
Click Run to launch the software. Dell System Detect will display your service tag and computer model number. 5. Visit the Dell Product Support for Home Users page (link in Resources). Enter your Service Tag number in the applicable box and click Submit.. A new page displays more information about your desktop model.
Do not confuse this tag with the Windows tag, which may be located in the same area on the computer. Go online to find your service tag, if you can't find the sticker. Navigate to Dell's support site and search for System Profiler.. When prompted for the scan answer Yes to allow it.Dell will scan your computer and find your serial number. Check your serial number right from your computer by clicking on the Start button, choosing Run and typing cmd.When the command window appears, type wmic bios get serialnumber, then press Enter to see the serial number. Write down your serial number and keep it in a safe place. 2  Over time the label that is affixed to your Dell computer may begin to fade and wear off, so keeping your serial number in written form will make it easier to get service when you need it.