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.
Check out the below image examples of locating the dell serial number and other details like date of manufacturing and place of manufacturing and the PPID for two different models. For you information, dell serial Number is a 20 digit PPID number on the label to verify the manufacture date. The above monitor(dell s2209w and s2409w and other dell monitors) has the bar code serial number located at the back which can be viewd by just turning the monitor around.