Possible reasons why a monitor would show display briefly and shut off?

[Matxe92]

I got a new graphics card and a new monitor.
The monitor is an LG 24 24gn600.

When i connect them via an HDMI cable everything works fine.
However, when i connect them via a Displayport cable(also new), i get a display for 2-3seconds and then the monitor shuts off.

Under the monitor a red light turns on, however i do not know if that's just a standby light or it's indicating an error of some sort.

I also tried using the same displayport cable on an older monitor, since i read there is backwards compatibility. This monitor turns on, green light is on, but there is no display.
My AMD adrenaline software registers a secondary monitor with the correct model name etc.

What could it be?

 

[joemama]

I don't think monitors have lights to indicate errors
I would guess there's something wrong with the cable or port of the GPU as you have tested on 2 monitors

 

[Marcus L]

Definitely points to cable or display port connector on the GPU, try another cable and you will get your answer

 

[Matxe92]

Definitely points to cable or display port connector on the GPU, try another cable and you will get your answer

My GPU has 3 displayports, all three, same result. So that points more strongly to the cable right?

I don't think monitors have lights to indicate errors
I would guess there's something wrong with the cable or port of the GPU as you have tested on 2 monitors

My GPU has 3 displayports, all three, same result. So that points more strongly to the cable right?

 

[Regeneration]

Bad output/input ports, bad cable, or bizarre incompatibility between the graphics card and monitor.

 

[Ownedtbh]

also noticed this phenomenon on my mine too after Monitor goes to sleep during the night or after boot.
I fix this by reinstalling the gpu driver, still searching for an error/solution.
This only happens when i fire up a game

 

[Marcus L]

My GPU has 3 displayports, all three, same result. So that points more strongly to the cable right?


My GPU has 3 displayports, all three, same result. So that points more strongly to the cable right?

I would say so, make sure you have upto date GPU drivers and try a different cable if you can, or use HDMI?

 

[Bill_Bright]

Under the monitor a red light turns on, however i do not know if that's just a standby light or it's indicating an error of some sort.

Ummm, did you check the manual? You have to use the monitor's internal menu to select the proper input.

I don't think monitors have lights to indicate errors

Actually, according to his manual, there are different indications with the Power LED depending on if the Power LED is displaying Red, White, flashing or on solid.

My GPU has 3 displayports, all three, same result. So that points more strongly to the cable right?

Not necessarily. It could be the card itself - assuming again, the monitor's input selector has been set to DP.

It is highly unlikely it is the connector on the card. Connectors don't just go bad unless physically damaged (bent or broken pins, for example). And the odds of 3 different connectors being physically damaged at the same time would be astronomical.

I also tried using the same displayport cable on an older monitor... ...but there is no display.

And do you know for a fact this 2nd monitor works with a DP input?

 

[Matxe92]

Ummm, did you check the manual? You have to use the monitor's internal menu to select the proper input.

Actually, according to his manual, there are different indications with the Power LED depending on if the Power LED is displaying Red, White, flashing or on solid.


Not necessarily. It could be the card itself - assuming again, the monitor's input selector has been set to DP.

It is highly unlikely it is the connector on the card. Connectors don't just go bad unless physically damaged (bent or broken pins, for example). And the odds of 3 different connectors being physically damaged at the same time would be astronomical.


And do you know for a fact this 2nd monitor works with a DP input?

The manual states that, it is "recommended" to use the provided cable(an HDMI 2.0) to avoid possible malfunctions.
But to ship a monitor with displayport connectivity and not being able to use it would be absurd and a scam.

I'm not able to access the monitor menu when i'm using DP.

I just thought i'd be able to use any 1.4 displayport cable with my monitor. But perhaps not all cables are created equally idk, i have very weak knowledge on cables.
Transmission of data is too fast for the monitor maybe?

 

[Bill_Bright]

The manual states that, it is "recommended" to use the provided cable(an HDMI 2.0) to avoid possible malfunctions.
But to ship a monitor with displayport connectivity and not being able to use it would be absurd and a scam.

My comment had nothing to do with whether or not the monitor supported DP. I thought it pretty clear (considering I quoted you) my comment was in reference to you saying you did not know what the LED light indicated. The manual does provide some info on that.

I'm not able to access the monitor menu when i'm using DP.

You might try connecting both HDMI and DP cables. Then, when in HDMI mode, access the internal menu and see if you can then select DP mode.

 

[Matxe92]

My comment had nothing to do with whether or not the monitor supported DP. I thought it pretty clear (considering I quoted you) my comment was in reference to you saying you did not know what the LED light indicated. The manual does provide some info on that.


You might try connecting both HDMI and DP cables. Then, when in HDMI mode, access the internal menu and see if you can then select DP mode.

It's an indication of "On" mode. Not an error.

Just tried that, no luck. The screen recognizes a displayport being connected and prompts me to switch over to it, which i did, and recieved a black screen.
Thanks for the suggestions btw.

I think it just might be the cable to be honest(hopefully), i just don't understand how it could be, it's a new 1.4 DP cable.

 

[Bill_Bright]

New, sadly, does not mean good. First, not all cables are made equally. Second, even with the top brands and models, it is very rare for manufacturers to test their products these days before they leave the factory to ensure there are no manufacturing defects. The logistics involved is too expensive. They would just rather deal with the lower costs of dealing with products that are returned as defective.

I asked earlier - are you sure the 2nd monitor works with DP input?

In any case, I would try a different DP cable. It would be good if you could borrow one for testing first.

 

[Matxe92]

New, sadly, does not mean good. First, not all cables are made equally. Second, even with the top brands and models, it is very rare for manufacturers to test their products these days before they leave the factory to ensure there are no manufacturing defects. The logistics involved is too expensive. They would just rather deal with the lower costs of dealing with products that are returned as defective.

I asked earlier - are you sure the 2nd monitor works with DP input?

In any case, I would try a different DP cable. It would be good if you could borrow one for testing first.

Oh, yea right sorry. It has a displayport, i haven't been able to find out what port version exactly. Just thought i could pop any DP cable in tbh.
I did buy the DP cable at a retailer not specialized in gaming hardware by any means or TV's for that matter.

YeS. I am indeed getting a different DP cable from the retailer i bought the monitor and GPU at, i think that will be my last try before sending it in as defect.
Again thanks for the help.

 

[nomdeplume]

DP cables are not the type of cable you shop outside very established and reputable brands. Basically the opposite of HDMI.

Personally I would buy one of a few brands that carry the official DP certification - from somewhere that makes returns easy. If monitor #2 works with it and monitor #1 doesn't you may choose to return monitor, cable, or both.

 

[LabRat 891]

Get a good DP cable, in the meanwhile try to set your resolution and refresh rate below native to see if the Monitor displays video.
I (as others) suspect the DP link is being corrupted or lost as soon as it's 'loaded'.

A corrupted or forgotten custom EDID would potentially cause this as well. Has a 'clean' driver uninstall and reinstall been performed?
(DDU will delete/uninstall any 'remembered' displays, and their potentially errant settings)

Also, what GPU? Many of the for-purpose mining Polaris cards have all sorts of HDMI, and video link issues until forced into PCIe Gen2.

 

[eidairaman1]

Oh, yea right sorry. It has a displayport, i haven't been able to find out what port version exactly. Just thought i could pop any DP cable in tbh.
I did buy the DP cable at a retailer not specialized in gaming hardware by any means or TV's for that matter.

YeS. I am indeed getting a different DP cable from the retailer i bought the monitor and GPU at, i think that will be my last try before sending it in as defect.
Again thanks for the help.

What gpu?