Displayport cable issue NEED HELP !!

[MickeyH]

Hi everyone.
Ths is actually a longer story but im gonna try and keep it short and precise. 
I have 2 monitors, Acer predator XB271HU (IPS) and Acer predator XB271HUA (TN). The IPS panel is set as my primary screen, where im using the displayport cable that was included.
For the second monitor i had to go and buy a longer displayport cable (3m) 
When i boot up the pc with just the IPS monitor plugged in, everything works. But when i plug in the second monitor with the long cable i bought, the GPU doesnt wanna boot up. It just pulses in orange and i get no signal on either screens. This made me think that the problem is with the long cable, somehow interfering with the computer (weird) so i tried shutting down the computer, unplug the long cable so i just had the main monitor plugged in, and sure enough, computer boots up fine again.
Now i know that the problem appears for sure, whenever i have two displayport cables plugged in on boot. At this point i strongly suspected that either something was wrong with the displayport or something else more serious, but i decided to check if maybe it could be the cable, so i used the displayport cable that came with the second monitor (identical to the main monitor cable) plugged it in, and booted computer. It worked.
Now i can safely say that the long displayport cable i bought is causing the issue somehow.
Is the cable defect or what is going on? How can a displayport cable connected to a monitor that is not even turned on cause a computer boot failure? I thought all displayport cables were the same, or am i missing something?

[SimplyGone]

Not all DisplayPort cables are the same no.  Are you sure you've bought a DP 1.4 compatible lead?  I know the internals are all the same on the cables but they're not all made equally.    I'd say you were using a DisplayPort 1.2 certified cable in a 1.4 scenario  

 

Edit

Either that or the 3m cable is damaged

[DarkEnergy]

fyi, you can plug in monitors while your computer is still on.

[MickeyH]

4 minutes ago, YouSirAreADudeSir said:

Not all DisplayPort cables are the same no.  Are you sure you've bought a DP 1.4 compatible lead?  I know the internals are all the same on the cables but they're not all made equally.    I'd say you were using a DisplayPort 1.2 certified cable in a 1.4 scenario  

 

Edit

Either that or the 3m cable is damaged

https://www.avxperten.dk/displayport-kabel/displayport-kabel-4k-3m.asp# this is the cable i bought, its a danish website but i cant see anything about the 1.2 and 1.4 you mention.

I dont know anything about this in particular apparently, so could you educate me a bit about those standards, and which one im supposed to use and why ? also maybe how i know which is which if nothing is said about the cable on the retail site.

[SimplyGone]

2 minutes ago, MickeyH said:

https://www.avxperten.dk/displayport-kabel/displayport-kabel-4k-3m.asp# this is the cable i bought, its a danish website but i cant see anything about the 1.2 and 1.4 you mention.

I dont know anything about this in particular apparently, so could you educate me a bit about those standards, and which one im supposed to use and why ? also maybe how i know which is which if nothing is said about the cable on the retail site.

Says:

 

Quote

DisplayPort for DisplayPort 1.2 cable of 3 meters. The cable supports 4K2K Ultra HD resolution. 

https://www.avxperten.dk/displayport-kabel/displayport-kabel-4k-3m.asp#

 

In the very first line in the description!!!

 

Please, we're not going to do your work for you 

 

But in short.  DisplayPort 1.2 doesn't have the bandwidth to drive your 1440p 144Hz Display.  You need a 1.4 to do that

[MickeyH]

10 minutes ago, DarkEnergy said:

fyi, you can plug in monitors while your computer is still on.

I know, but i dont really wanna plug in my second monitor every time i want to use it, and then unplug it when im done. It should be able to stay connected to pc at all times, otherwise whats the point?

[MickeyH]

3 minutes ago, YouSirAreADudeSir said:

Says:

 

https://www.avxperten.dk/displayport-kabel/displayport-kabel-4k-3m.asp#

 

In the very first line in the description!!!

 

Please, we're not going to do your work for you 

 

But in short.  DisplayPort 1.2 doesn't have the bandwidth to drive your 1440p 144Hz Display.  You need a 1.4 to do that

Okay thats a bit embarrasing, but its late and im pretty tired so i apologize

Im still confused as to why just having the cable plugged in, causes my graphics card to not boot up and deliver signal to any of the screens? I could understand that i wouldnt get any picture on the second monitor since the cable doesnt have the bandwidth as you said, but causing the issue i had seems really weird.

[SimplyGone]

9 minutes ago, MickeyH said:

Okay thats a bit embarrasing, but its late and im pretty tired so i apologize

Im still confused as to why just having the cable plugged in, causes my graphics card to not boot up and deliver signal to any of the screens? I could understand that i wouldnt get any picture on the second monitor since the cable doesnt have the bandwidth as you said, but causing the issue i had seems really weird.

Just one of those things i guess.  It could also be a faulty cable like i said earlier too.  Have you tried just the 3m cable on it's own?  In either of the monitors?

[SimplyGone]

22 minutes ago, MickeyH said:

Okay thats a bit embarrasing, but its late and im pretty tired so i apologize

Im still confused as to why just having the cable plugged in, causes my graphics card to not boot up and deliver signal to any of the screens? I could understand that i wouldnt get any picture on the second monitor since the cable doesnt have the bandwidth as you said, but causing the issue i had seems really weird.

According to This:

 

Quote

Resolution and refresh frequency limits[edit]

To support a particular format, the source and display devices must both support the required DisplayPort version or higher. Note that the "version" of a connection depends on the versions of the DisplayPort ports on the source and sink devices, not on the DisplayPort cable itself.

8 bpc color depth (24 bit/px or 16.7 million colors) is assumed for all formats in this table. This is the standard color depth used on most computer displays. Please note that some operating systems refer to this as "32-bit" color depth—this is the same as 24-bit color depth. The 8 extra bits are for alpha channel information, which is only present in software. At the transmission stage, this information has already been incorporated into the primary color channels, so the actual video data transmitted across the cable only contains 24 bits per pixel.

 

From

 

https://en.wikipedia.org/wiki/DisplayPort

 

1.2 Should be able to support your resolution and refresh rate.  So i'd say it was a faulty cable

[MickeyH]

11 minutes ago, YouSirAreADudeSir said:

According to This:

 

From

 

https://en.wikipedia.org/wiki/DisplayPort

 

1.2 Should be able to support your resolution and refresh rate.  So i'd say it was a faulty cable

I also looked up the specs of my screen and it says that the displayport is 1.2, (on both tn and ips version). so i figure the cable they include are the same.

Another thing about the 3m cable i bought. If i plug it in AFTER the computer has booted i can get a signal on second monitor, but the problem comes if it is connected when i turn on pc. And as i said earlier, if i use the other 1m cabel that came with the monitor i can have both plugged in when i turn on pc and it boots up just fine. So yeah must be something with the 3m cabel, but its really weird imo.

[SimplyGone]

28 minutes ago, MickeyH said:

I also looked up the specs of my screen and it says that the displayport is 1.2, (on both tn and ips version). so i figure the cable they include are the same.

Another thing about the 3m cable i bought. If i plug it in AFTER the computer has booted i can get a signal on second monitor, but the problem comes if it is connected when i turn on pc. And as i said earlier, if i use the other 1m cabel that came with the monitor i can have both plugged in when i turn on pc and it boots up just fine. So yeah must be something with the 3m cabel, but its really weird imo.

How long ago did you buy the cable?  Return it.  Shit happens you just gotta remember not to fall back in it

[MickeyH]

2 minutes ago, YouSirAreADudeSir said:

How long ago did you buy the cable?  Return it.  Shit happens you just gotta remember not to fall back in it

Bought last thursday, delivered last saturday, so just got it pretty much. Im calling them tomorrow and ask for a replacement. Hope that will solve it.

Thanks for your help dude

[LinusOnLine]

A lot of my friends have had these problems with cheaper longer DP cables. Even if they say they supports DP 1.4 a lot of the cheaper ones does not seem to do that.