Hitachi CP-X809W User Manual page 85

Troubleshooting
Phenomena that may be easily mistaken for machine defects (continued)
Phenomenon
74
The signal cables are not correctly connected.
The MUTE function is working.
The AUDIO setting is not correct.
The audio on the HDMI input is muted.
The digital audio in HDMI signal does not work well.
The signal cables are not correctly connected.
The computer cannot detect the projector as a plug and play monitor.
The BLANK screen is displayed.
The HDMI cable is not correctly connected.
The signal format on the HDMI is not supported.
Reference
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