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.
1 Check if the Webcam is detected in Device Manager. Open the Start Menu, type âdevice managerâ in the search box and press <Enter>. Expand the tab for Imaging Devices and check if the webcam is detected.  Run the Dell PC Diagnostics for Webcam.