Troubleshoot Missing Video Issues

If no image is displayed on the monitor or projector, first make sure that the display device is plugged in and turned on
Check that the monitor is not in standby mode (press a key or cycle the power to the monitor to activate it)
may also need to use controls on the monitor itself to adjust the image or select the appropriate data source or input channel

Physical Cabling Issues

If the display is powered on and you can rule out a problem with the input source, check the cable and connectors between the video card and monitor
Make sure the cable is connected securely at both ends and is not loose
Make sure that the cable has not become stretched or crimped
Verify that the cable specification is valid for the application
- E.g., basic HDMI cable might not be sufficient quality for 4K resolution, which requires High Speed rated cable

A video projector is a large-format display, suitable for use in a presentation or at a meeting
The image is projected onto a screen or wall using a lens system
can use different imaging technologies, such as cathode ray tube (CRT), liquid crystal display (LCD), and digital light processing (DLP)
Projector bulbs have a limited lifetime and will often need to be replaced
might notice the image generated by the projector start to dim
may also be a bulb health warning indicator light
A completely failed bulb is referred to as a burned-out bulb
might hear a “pop” from within the bulb and observe scorch marks on the inside or a broken filament

Intermittent projector shutdown is typically caused by overheating
Check that the projector’s:
- fan is working
- vents are free from dust and are not obstructed
- the ambient temperature is not too high
If you can rule out overheating, check for loose connector cables and verify that the bulb is secured properly