Second monitor connected to my iMac won't turn on.

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Arraktur Author

Level 1

4 points

Second monitor connected to my iMac won't turn on.

I have 2nd monitor connected via sitecom "CN-393v1.001 USB-C Multiport Adapter + PD".

For some reason after sleep mode the second monitor won't turn on.

there is no messages that there is no signal or some thing like that.

problem is not permanent, from time to time it's working fine.

the only solution right now is to disconnect the whole adapter from Mac and reconnect it.

external HDD connected to the same adapter working with no problems.

[Re-Titled by Moderator]

iMac 24″, macOS 12.3

Posted on May 5, 2022 11:15 AM

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Answer 1

Best reply

ChloeJudy

Level 1

15 points

May 6, 2022 6:27 AM in response to Arraktur

It is because sleep mode for a long time may cause power failure, in order to protect the adapter and your computer. It is recommended to turn off the computer when you don't use it, and don't enter sleep mode for a long time.

Hope that helps.

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Answer 2

den.thed

Level 9

77,242 points

May 5, 2022 11:38 AM in response to Arraktur

I would test the Apple multiple port adapter or the Belkin USB-C to HDMi adapter plugged directly into the iMac.

USB-C Digital AV Multiport Adapter - Apple

Belkin USB-C to HDMI Adapter - Apple

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Second monitor connected to my iMac won't turn on.

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