Why is my screen displaying weird colors or lines?

Check the video input cable is securely connected
Check the inputs and outputs of the device and make sure that the cables are correctly connected.
Try restarting the device
To restart the device, turn it off and unplug it. Wait 30 sec and plug it back in.
Inspect the device
Inspect the device and make sure that none of the hardware components are dislodged or physically damaged.
Check the device settings
Look at the settings of the device and make sure that they are set correctly.
Update the device firmware
Download the latest firmware update and install it on the device according to the manufacturer’s instructions.