Problem with Connecting my Macbook Pro to my Dell Monitor P2419H

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Level 1

8 points

Problem with Connecting my Macbook Pro to my Dell Monitor P2419H

I bought a new Dell monitor P2419H and I am trying to get it connected to my Macbook Pro. I bought the DP to USB-C cable and I also have the HDMI to USB-C cable. I tried to connect the monitor using the DP cable and for the first few hours it was displaying the screen. I then had to disconnect my laptop to take it elsewhere. When I returned and tried to connect it the same way it did not work. The monitor gives the notification that it is going into power saving mode and the screen shows "No DP signal detected". When I try to connect the Monitor using the HDMI cable the same message is shown "No HDMI signal detected". I know that it is not a problem with the monitor because it works fine with my dell laptop. Any help on how to solve this issue would be great.

Thank you

MacBook Pro

Posted on Jul 8, 2020 9:56 AM

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Answer 1

Top-ranking reply

Grant Bennet-Alder

Level 10

140,045 points

Jul 8, 2020 10:50 AM in response to ace147

DisplayPort (family) is vastly preferable over HDMI is all cases when your display has both.

to get a Mac display to become active, you need the Mac to query the display, and the display to answer with its name and capabilities. Otherwise, the display will not be shown as present, and no data will be sent to the display.

This query is only sent at certain times:

• at startup

• at wake from sleep

• at insertion of the Mac-end of the display-cable, provided everything on that cable is ready-to-go

• on invoking Option-(Detect Display) button in Displays preferences (from another display)

so try doing some of those things and see if the display comes alive.

Modern Displays with multiple ports are sometimes busy scanning the other ports, looking for an input, and miss the query from the Mac. They need to pay attention to the port you are actually using, or they will miss the query.

Some displays have On-Screen Display settings that can be used to tell the display a computer is attached on a certain port, or a certain port should be highest priority. Changing those may make your display more responsive.

Some displays include their own private "sleep" settings for the display alone. This can allow the display to enter its own sleep mode, on top of the Mac's not sending it data. A display that is sleeping on its own cannot respond to the Mac's query, and will stay dark.

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Answer 2

Jul 11, 2020 9:47 AM in response to ace147

This query is only sent at certain times:

• at startup

• at wake from sleep

• at insertion of the Mac-end of the display-cable, provided everything on that cable is ready-to-go

• on invoking Option-(Detect Display) button in Displays preferences (from another display)

The most obvious way on a MacBook Pro is to use the fourth one.

Open System Preferences > Displays

Hold down the Option button, and the (Detect Displays) button appears in the lower right corner. Click on it

Next simplest is to deliberately sleep-and-wake your Mac:

Option–Command–Power button* or Option–Command–Media Eject : Put your Mac to sleep.
any key to wake

Next is to make certain that absolutely everything on the cable is ready-to-go, and plug the MAC-END of the cable into the chassis of the Mac. Any other cable re-connections will NOT cause the query and response.

last is to do a Restart

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Answer 3

ace147 Author

Level 1

8 points

Jul 9, 2020 10:20 PM in response to Grant Bennet-Alder

I tried the following things and it still did not work.

I connect the DP cable to the computer and switched off both the monitor and the Macbook and turned them on at the same time.
Switched off the monitor and switched it back on after connecting the cable while keeping the Macbook switched on
Switched off the Macbook while keeping the monitor switched on and turned it back on.
Switched on both the Macbook and the monitor and then connected both side of the cable.

Everytime the screen shows the message "No DP signal from your device. "

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Answer 4

ace147 Author

Level 1

8 points

Jul 11, 2020 8:49 AM in response to Grant Bennet-Alder

How do I get the Mac to query the display ? because I thought that connecting the DP cable would automatically query the display. That why I tried the following experiments. I don't get what you were asking me to do. Can you please clarify it a little bit ?

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Answer 5

Jul 10, 2020 6:07 AM in response to ace147

Gosh those are really interesting experiments.

But they do not correlate in the slightest to the four suggested methods I posted just above.

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Problem with Connecting my Macbook Pro to my Dell Monitor P2419H

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