Final answer:
The best first step when a laptop won't display through a projector is to check the cable connection between the two devices. If that does not resolve the issue, try restarting, adjusting display settings, or using a different video output port.
Step-by-step explanation:
If a user in the sales department cannot get his laptop to display through a projector, the first step to try would be to check the cable connection between the laptop and the projector. This is often the simplest solution and can resolve the issue if the cable is loose or not connected properly. If checking the cable does not solve the problem, one might then proceed to restart both devices, adjust the display settings on the laptop, or try a different video output port on the laptop if available.