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Press the FN (Function) and F8 keys simultaneously to make sure the laptop is not set to view from an external device like a projector or external monitor.
If you're using a docking station, restart the laptop and ensure it is properly docked, if you have issues pairing your devices to the docking station see the section below for instructions on how to restart the docking station.
Restart the computer.
Restart docking station
Unplug docking station from power source
Hold power button down for 30 seconds
Reconnect to power source
The docking station should redetect devices plugged into it
Remove black border around laptop screen
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