Please verify that all video cables are inserted properly.
It may be that your resolution or refresh rate is too high. Try a lower refresh rate, or try lowering the resolution.
Your video cable may be too long. Video signals are high frequency signals and are therefore subject to interference. Please use video cables that are as short as possible.
Make sure that the power adapter is plugged in at both ends and that it is working correctly. Its rating must be 9V 600mA.
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