Apple CP-X253 Electrical power cord is not plugged, Signal cables are not correctly connected

Troubleshooting

Phenomena that may be easy to be mistaken for machine defects

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Phenomenon	Cases not involving a machine defect	Reference
		page
	The electrical power cord is not plugged in.	10
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	The main power source has been interrupted during
	operation such as by a power outage (blackout), etc.	
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	Either there is no lamp and/or lamp cover, or either
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	The signal cables are not correctly connected.	8
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1HLWKHUVRXQGV	Signal source does not correctly work.	–
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	The input changeover settings are mismatched.	
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	The signal cables are not correctly connected.	8
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	The MUTE function is working.	14
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	The AUDIO setting is not correct.	32
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	The lens cover is attached.	13
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GLVSOD\HG	The signal cables are not correctly connected.	8
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