Monitor Appears in Nvidia Control Panel and Windows Display Settings, but Receives No Input.

[nicholasrrees]

The Hardware:

Gigabyte GTX 1070 (https://www.newegg.com/Product/Product.aspx?Item=N82E16814125875)

Acer Predator XB1 Series XB281HK (https://www.newegg.com/Product/Product.aspx?item=N82E16824011083)

ASUS VG248QE (https://www.newegg.com/Product/Product.aspx?Item=N82E16824236313)

AOC i2269Vw (https://www.newegg.com/Product/Product.aspx?Item=9SIA2F85YJ2566&cm_re=AOC_i2269vw-_-24-160-329-_-Product)

The Problem:

I cannot get my Asus monitor to receive input through DisplayPort. It was working prior to about 4-5 days ago (maybe up to a week, I'm not sure I just haven't had time to try to solve the issue until now). It seemed to spontaneously stop working.

I have been using DisplayPort cables for both the Acer monitor, and the Asus monitor. The Aoc monitor has been receiving input through a DVI-D cable.

In the Nvidia control panel, I can see the option to enable the Asus monitor, but it will not check the "box" to enable the input through the DisplayPort (see screenshot: https://imgur.com/a/Eu0Lf). When I do click on the checkbox to enable the DisplayPort input for the Asus monitor, my PC freezes for 20 seconds or so. When it comes to, the checkmark in the box appears for a second or two, and then disapears. I then get the dialogue box to "keep changes" or to "revert changes." Applying the changes accomplishes no change.

In the Windows Display Settings the monitor appears as a box to be rearranged, but is selected as "Disconnect this display." When I try to use any other option in the Multiple displays dropdown menu the computer freezes just like using the Nvidia Control Panel, and red text appears saying: "The display settings could not be saved. Please try a different combination of display settings." Again, the windows box comes up asking to "keep changes" or to "revert changes." But "keeping changes" does not enable the input. . .

My Troubleshooting so far:

1) Updated GeForce Game Ready driver version 388.00 (10/23/17) to the current 390.65 (1/8/18).
2) Swapped the DisplayPort cable to the Acer monitor, and vice versa. The Acer monitor works with the Asus DisplayPort Cable, and the Asus monitor still does not work with the Acer cable.
3) Uninstalled all windows updates since the new year; no change.
4) Reinstalled those windows updates; no change.
5) Restarted the PC with only the Asus monitor connected; no display.
6) The only luck I've had with this has been to take the DVI-D cable from the Aoc monitor I've been using and connecting it to the Asus monitor. I haven't bothered using an HDMI cable since this monitor has a 144hz refresh rate and HDMI does not (as far as I know) have the bandwidth to support that refresh rate.

Please help, I have no idea what to do at this point, and I'm at a loss. The graphics card seems to work just fine, as I have no problem with any of the other monitors. The monitor seems to work, except just not with DisplayPort. As a result, my Aoc monitor is useless since it does not have an HDMI port or a DisplayPort.

Thankyou.

 

[SirSub42]

Grab a cheap Displayport > DVI-D converter cable? How old is the monitor? May be a faulty displayport.

 

[drbones8472]

The Displayport cable itself may have gone bad somehow.

 

[nicholasrrees]

The problem is not the cable. The Asus' DP cable works perfectly fine with my Acer monitor. The Acer's DP cable does not work with the Asus monitor.

A DVI-D adapter could work, but I'd prefer to do actual troubleshooting and find out what the actual problem is. I don't see a reason why I shouldn't be able to use a DisplayPort connection.

 

[SirSub42]

You are free to try the monitor via the DisplayPort on a different system. If it works, then you know the port is not the issue. If that is the case, I would look into a debugging mode for the nVidia control panel. It has been a while since I have used Windows, but I know this sort of information can be accessed on Linux quite easily.

You could try running a bootable version of Ubuntu real quick and see how the monitors respond.

 

[Glenwing]

A DisplayPort to DVI adapter would only get you 1080p 60 Hz. You could use it for the AOC monitor though, and then that frees up the DVI port on your graphics card to use with the ASUS.

 

[SirSub42]

The adapter idea was more to just verify the monitor works and the port is blown. According to the Newegg link, the monitor comes with "ASUS Rapid replacement for 3 years".

 

[nicholasrrees]

You are free to try the monitor via the DisplayPort on a different system. If it works, then you know the port is not the issue. If that is the case, I would look into a debugging mode for the nVidia control panel. It has been a while since I have used Windows, but I know this sort of information can be accessed on Linux quite easily.

You could try running a bootable version of Ubuntu real quick and see how the monitors respond.

I should have clarified in my original post. When the Asus monitor is the only monitor connected (and it is connected by DP), there is no input even at the bios screen. I did, however, humor you and booted up my (admittedly quite old) Ubuntu installation. I could not get it to work.

However, just like when Windows is the OS, the monitor works just fine with a DVI-D connection.

You said:

The adapter idea was more to just verify the monitor works and the port is blown. According to the Newegg link, the monitor comes with "ASUS Rapid replacement for 3 years".

Now, I have told you that this particular monitor has a DVI-D port. That is the only way I can get it to work. Are you suggesting that I contact Asus? I purchased the monitor in June of 2016, so it seems like it might be elligible for a replacement--if the problem is the monitor's DP port . . .

But is there any way that I can be sure the problem is the DP other than the fact that I just can't seem to get it to work no matter what I do?

I'll see if there's a debugging mode for NVidia control panel.

 

[SirSub42]

I have been looking into this, and honestly, my best guess is a bad DisplayPort input on your ASUS monitor.. I was hoping to locate a cheap tool you could simply plug into the port on the monitor and would blink green if successful (or something along those lines). But to no luck.

You have mentioned you have tried nVidia drivers 388 & 390.
According to

[url=https://www.gigabyte.com/Graphics-Card/GV-N1070WF2OC-8GD-rev-20#support-dl]https://www.gigabyte.com/Graphics-Card/GV-N1070WF2OC-8GD-rev-20#support-dl[/url]

The recommended drivers for the device are 384, you could try downgrading.

One last ditch effort, a common solution I have come across while reading about DisplayPort problems, is to simply unplug the power cable from the ASUS while the computer is running, wait about 2 minutes and plug it back in. Something about the on board power control unit forcing the monitor to go off. I do not understand why this would work, but as I said, it was a common solution that I read about in similar situations and it seemed to have positive feedback.

As far as any way to say for sure it is a defective DP port on the ASUS, I believe it would take a more skilled tech to say for sure. All we can do is eliminate the probable solutions. But I would certainly send ASUS an email initiating the warranty process ASAP, especially for the price you paid.

 

[nicholasrrees]

One last ditch effort, a common solution I have come across while reading about DisplayPort problems, is to simply unplug the power cable from the ASUS while the computer is running, wait about 2 minutes and plug it back in. Something about the on board power control unit forcing the monitor to go off. I do not understand why this would work, but as I said, it was a common solution that I read about in similar situations and it seemed to have positive feedback.

My God, please tell me where/how you found this information. This fixed up the issue instantly (well technically it fixed the issue in about 2 minutes . . .). I never would have thought to actually unplug the power cord to the monitor, as I thought turning it off would have been sufficient.

Thank you so much.

For anyone in the future who has this issue, all I did was to unplug the power cable like SirSub42 suggested. I did not downgrade the driver to 384, nor did I have to request a replacement from Asus.

Again, thank you soooooooooooo much!

 

[SirSub42]

I don't quite understand either. Supposedly it only works if you unplug from the monitor and not from the wall. I would still look into placing that warranty claim or at least contacting tech support and informing them of the situation. Maybe they can explain why that works.

 

[Sandburst Shower]

Exact same problem here with two identical Dell U2414H monitors.
I fixed the issue with my second monitor by uninstalling Nvidia driver completely. After having my eye hurt by 800x600 resolution, windows automatically switched to its built in display driver, and the second monitor started working right away! My good luck didn't last long as a few days later windows automatically downloaded and installed Nvidia driver 388.** and the problem was back.

I really doubt the bad DP port hypothesis can be legit. It seems a software/driver issue to me. I've my first monitor connected via HDMI and the second via DP. The problem persists when I switch cables. The first monitor goes black.


My rig:
Dell motherboard
Intel core i7-4770 CPU
16 MB XPS8700 DDR3 RAM
Asus strix Nvidia Geforce GTX 970 GPU
Green 700watt PSU
Dual Dell U2414H monitors, one connected via HDMI cable and the other with a DP-mini DP cable