M! Mac Mini HDMI does not provide a signal

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Level 1

9 points

M! Mac Mini HDMI does not provide a signal

I have been happily using my M1 Mini with an external monitor connected via USB-C. No problems. But when I recently tried connecting a second monitor via the HDMI port, that second monitor says "No Signal". When I look at Displays in System Prefs, I see the second monitor and supposedly can set it to extend or mirror the main display. Only problem is that there is nothing showing on the second display. So it seems the Mini can detect that a second monitor is present even though no signal is getting through.

Tried the second monitor using USB-C - works fine. Tried using HDMI from a different computer to the second monitor - also fine. Tried connecting my primary display via HDMI (it has HDMI and USB-C ports). "no signal".

Am I right in thinking this points to a problem with my Mini's HDMI port? Is there a way to check this before going the repair route?

Thanks

Posted on Feb 15, 2022 9:45 PM

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Answer 1

den.thed

Level 10

91,312 points

Feb 16, 2022 7:41 AM in response to scmcclary

Make sure the Mac Mini has the latest macOS 12.2.1 update.
Test a Premium Certified HDMI cable and a couple more restarts.

Then if those do not help, a Support call and/or Service visit is in order.

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Answer 2

Feb 16, 2022 2:02 PM in response to scmcclary

scmcclary wrote:

Using 12.2.1.

Cable is 1 meter, certified 4K.

Both monitors accept USB-C and HDMI inputs; USB-C works with both, HDMI works with neither.

I'm getting another HDMI cable and I'll try that. How to sort them out when everyone claims to be "certified?"

Not all cables are certified!

If the package does not have these markings, it is not certified:

And for 4K you should be using the UltraHighSpeed certified.

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Answer 3

Feb 16, 2022 5:43 AM in response to scmcclary

In addition, are you using a certified HDMI cable or the usual cheap one that vendors usually supply with their displays to cut costs? Basically get a quality HDMI certified cable. Also, make sure it is certified for the resolution you have, i.e. 4K, QHD, HD.

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Answer 4

hcsitas

Level 6

13,964 points

Feb 16, 2022 8:19 AM in response to scmcclary

Hold on the cable swap, what monitors? Makes and models.

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Answer 5

hcsitas

Level 6

13,964 points

Feb 16, 2022 12:25 AM in response to scmcclary

How long is the cable? What monitors both HDMI & USB C?

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Answer 6

hcsitas

Level 6

13,964 points

Feb 17, 2022 12:11 PM in response to scmcclary

Do you have a link for the Lepow LM156LCFL-03? What ports are on it?

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Answer 7

scmcclary Author

Level 1

9 points

Feb 18, 2022 8:07 AM in response to hcsitas

Actually, both monitors work fine when driven by the USB-C port. Neither works when driven by the mini's HDMI port.

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Answer 8

hcsitas

Level 6

13,964 points

Feb 18, 2022 8:22 AM in response to scmcclary

If you want both of them to work together, ditch the Lepow and replace per my earlier post. All the best!

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Answer 9

scmcclary Author

Level 1

9 points

Feb 16, 2022 7:59 AM in response to den.thed

Using 12.2.1.

Cable is 1 meter, certified 4K.

Both monitors accept USB-C and HDMI inputs; USB-C works with both, HDMI works with neither.

I'm getting another HDMI cable and I'll try that. How to sort them out when everyone claims to be "certified?"

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Answer 10

hcsitas

Level 6

13,964 points

Feb 17, 2022 9:39 PM in response to scmcclary

”on a monitor with your PS3, PS4, XBOX ONE, Wii or Nintendo Switch etc”

- Apple isn’t mentioned. I would return it and find a regular monitor with DisplayPort and connect it as secondary using a dongle. Avoid all USB C monitors, nothing but trouble. In the meanwhile, use in single-monitor configuration only, with the Lenovo connected to the mini’s HDMI port. All the best.

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Answer 11

scmcclary Author

Level 1

9 points

Feb 17, 2022 11:12 AM in response to hcsitas

Primary Monitor is Lenovo Q24h-10.

Secondary is Lepow LM156LCFL-03

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Answer 12

scmcclary Author

Level 1

9 points

Feb 17, 2022 8:54 PM in response to hcsitas

The Lepow has mini-HDMI and USB-C ports. Both work when driven by another computer (Raspberry Pi 400). From the Mac Mini, the USB-C port works but the HDMI doesn't.

https://ilepow.com/products/z1

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M! Mac Mini HDMI does not provide a signal

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