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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.