Question: how to set up a second monitor to dell laptop?
Answer: Check to see if your specific Dell laptop model has an S-Video port, VGA port or DVI port. ... 
Acquire a corresponding cable. ... 
Press the "FN" and "F8" keys at the same time to switch the display to the external monitor. ... 
Press the keys a third time to switch back to displaying images only on the Dell laptop's LCD screen.