Troubleshoot a black monitor

HARDWARE PROBLEMS - BLACK MONITOR (COMPUTER IS ON))

NO POWER LIGHTS ON MONITOR

1. Check your power (power strip, cable, etc.)
2. Try another power source
3. Try another working power cable (from printer, etc)
4. Press the power button on the monitor.
5. Still no power, purchase a replacment monitor.

POWER LIGHTS ON THE MONITOR

• What colors are the lights?
  • Green / Blue (Power & Signal)
    1. Restart the Computer
    2. Try to unplug and plug-in your VGA / DVI / HDMI cable from both the monitor and computer
    3. Try a different VGA / DVI / HDMI Cable
    4. Reset PRAM (instructions).
       • Power off your Mac.
       • Press your Mac’s power button and then immediately hold these four keys at the same time:
         ⌘ + option + P + R.
       • Continue holding the keys until your Mac restarts for the second time. On older Macs, the chime will sound upon restart. On newer Macs, the Apple logo will appear and then disappea
  • Amber / Yellow (Standby or non-synched)
    1. Check monitor cable
    2. Restart the computer in safe mode (instructions).
       • Power off your Mac.
       • Press your Mac’s power button and then immediately press and hold left shift button as the computer turns on.
       • If your machine powers on at this point, it indicates there is an extension or application that may be causing the issue.
    3. Boot in to recovery mode (instructions).
       • Power off your Mac.
       • Press your Mac’s power button and then immediately press and hold Command (⌘) + "R"
       • Reinstall macOS
    4. Reset PRAM (instructions).
       • Power off your Mac.
       • Press your Mac’s power button and then immediately hold these four keys at the same time:
         ⌘ + option + P + R.
       • Continue holding the keys until your Mac restarts for the second time. On older Macs, the chime will sound upon restart. On newer Macs, the Apple logo will appear and then disappea