Asus PB278Q monitor loses DisplayPort signal

[Triniman]

This is a newly built system. It was working fine, but now when I boot up or resume from screen saver or power savings, the monitor shows the message DisplayPort No Signal. The only way to get the display to show the video signal is to unplug the DP cable from the monitor and plug it back in.

I have no discrete video card, so I'm using the DP on the Asus P8Z77-V Deluxe motherboard. It also has HDMI but I don't want to use it since I'm using a 27" monitor at 2560 x 1440.

I did change the Power Settings in Control Panel to High Performance but that hasn't made a difference. Running Win 7 Pro 64-bit.

 

[gorobei]

off hand i would guess its a driver issue. displayport requires a handshake between devices on the bus. if the motherboard isnt sending the wake signal the monitor wont be detected. i had a similar problem with intel igp and no wake when i sent a videocard in for rma.

check with mb maker or intel video driver updates. possibly poke around bios settings.

 

[Triniman]

You could be right about it being a driver issue. I wonder, though, why it worked fine, initially. Also, I noticed that the monitor's on button has a green light to show that the unit is on. The green light doesn't come on anymore, making me think that the monitor has a hardware fault.

 

[cl-scott]

I'd like to see you testing with HDMI. Even if you don't want to use it as a long-term solution, if you get the same issue with HDMI it's probably an issue with the monitor.

Beyond that, I would test with a different DP cable. Finally, if you can get a second monitor with DP to test, that would help pin it down between whether it's an issue with the monitor or motherboard. If it ends up being some kind of a hardware issue, since we're dealing with an all Asus setup, I can issue the appropriate RMA if needed.

Also, updating drivers is always a reliable standby for a reason. Worst case scenario is that it doesn't really do anything to improve your situation.

 

[Triniman]

I'd like to see you testing with HDMI. Even if you don't want to use it as a long-term solution, if you get the same issue with HDMI it's probably an issue with the monitor.

Beyond that, I would test with a different DP cable. Finally, if you can get a second monitor with DP to test, that would help pin it down between whether it's an issue with the monitor or motherboard. If it ends up being some kind of a hardware issue, since we're dealing with an all Asus setup, I can issue the appropriate RMA if needed.

Also, updating drivers is always a reliable standby for a reason. Worst case scenario is that it doesn't really do anything to improve your situation.

I bought the monitor less than 30 days ago and have 30 days to exchange it at the store so I may end up doing that. I do have another brand-new DP cable that I can try, but I don't have access to another DP monitor to try.

I suspect it is a hardware issue with the monitor as the green light for the power should come on but no longer does. This can't be MB related.

Thanks for your response.

 

[cl-scott]

I bought the monitor less than 30 days ago and have 30 days to exchange it at the store so I may end up doing that. I do have another brand-new DP cable that I can try, but I don't have access to another DP monitor to try.

I suspect it is a hardware issue with the monitor as the green light for the power should come on but no longer does. This can't be MB related.

Thanks for your response.

I worked as a hardware tech for a few years, and a number of times when I would get a little cocky and say, "It can't be that," well, no prizes for guessing what it would end up being. Moral of the story: Until you can reproduce the issue on command, and can demonstrably show it's the monitor, everything is still on the table.

So if it does end up being the motherboard (I do agree it's unlikely), let me know. If you have any issues swapping the monitor with the retailer, I can sometimes help with that as well.

 

[Triniman]

I worked as a hardware tech for a few years, and a number of times when I would get a little cocky and say, "It can't be that," well, no prizes for guessing what it would end up being. Moral of the story: Until you can reproduce the issue on command, and can demonstrably show it's the monitor, everything is still on the table.

So if it does end up being the motherboard (I do agree it's unlikely), let me know. If you have any issues swapping the monitor with the retailer, I can sometimes help with that as well.

Good thoughts, Scott.

I'm going to borrow a laptop from work that has DP on it, to see what happens.

I appreciate your interest in trying to help me out here.

 

[Triniman]

The monitor worked with the new DP cable, but upon reboot, it didn't work. Even the blue power light for the monitor stopped working. When the cable was unplugged from the monitor and re-attached, it would work. Then, upon turning the system off and on again, that procedure would not work.

Tried the monitor with the DP on a laptop. The first time, it worked, but upon reboot, it would not. Same thing, unplug the cable from the monitor then reconnect it, and sometimes it would work.

The power light is supposed to turn blue when the monitor is on, and turn amber when in standby mode. It is totally dark when the monitor is on.

 

[laracroft]

It's 2014 and brand-new ASUS PB278Q with Mac Pro still has the same problem. (Surprised the ASUS PB278Q has been around so long!)

It has improved, however. When the MacPro itself slept before, ASUS would not wake--with Mac OS 10.9.3.

Now, with OS 10.9.4 (which claimed to fix Mac wake issues), ASUS wakes properly.

BUT... Strangely, when only all displays sleep (there are 4 total), waking displays does not wake ASUS on thunderbolt/mini displayport port (using displayport to mini displayport cable). Also strange: Mac still sees the ASUS as attached, even though it's asleep (or something). Turning ASUS off and then on wakes it, but then Mac sees the ASUS as if it were unplugged and replugged. All app and finder windows get reallocated to the three other displays! Better solution is to put the entire Mac to sleep and wake it (slow process!!); ASUS wakes with MAC (OS 10.9.4) and all windows remain as was.

 

[DidierDisc]

Firstly, I hope this issue gets resolved because the screen is gorgeous. But really, it's kind of awful that the issue is still unresolved after nearly a decade.

My issue is the same as everyone else; the screen worked great for a time and then it stopped waking after sleep or would require a reboot immediately after trying a cold boot.

Image signal via displayport cable through EVGA GTX 780 ti Classified.

 

[whiplash4]

After several days of troubleshooting I have resolved the problem on my end.

There is a feature on newer motherboards in which they have sleep state settings outside the control of the operating system. Go into your bios and go to APM configuration. Look for ErP setting (default is usually disabled) and enable it to S4+S5 sleep state. This solved my problem, now my monitor will show a display after computer wakes up from sleep or when powered off.

Hope this helps.

*Note* I have Asus Maximus VII Formula MOBO

 

[mxt]

Hi,

I have the same issue, ocurring on a P8-Z77 and Z97-A
wakes up ok from sleep but if working for several hours on a row, it sudenly flickers off with a noise similar to disconnecting an audio cable.

light turns amber

have to power off and then on. and when i turn off windows get rearranged (know this because have two more monitors connected)

The Erp settings does not solve this.

any updates ?
Thanks

 

[Majcric]

I read about this issue on Amazon reviews before I bought my monitor. Since I run a discrete GPU it is not a problem. I don't know if a solution was ever found for this issue. If you like the monitor and wouldn't mind the extra cost of a cheap video card that would almost certainly fix it.

 

[mxt]

I read about this issue on Amazon reviews before I bought my monitor. Since I run a discrete GPU it is not a problem. I don't know if a solution was ever found for this issue. If you like the monitor and wouldn't mind the extra cost of a cheap video card that would almost certainly fix it.

Hi, thanks for the reply.

So you're saying that this happens connected via displayPort do the motherboard but will not happen if connected also via displayport but to an external GPU

So this seams to indicate a Mobo problem...

btw: i am testing it with HDMI for 3 days and the issue has not ocurred yet so it's not a monitor problem..
Thks

 

[birthdaymonkey]

Displayport is buggy. If it's an option, I'd get a cheap video card with DVI-DL and use that instead.

I hope that by the time I upgrade to 4K (not going to happen for a couple years), the bugs will have been worked out.

 

[deedubdw]

Since I run a discrete GPU it is not a problem. I don't know if a solution was ever found for this issue. If you like the monitor and wouldn't mind the extra cost of a cheap video card that would almost certainly fix it.

I'm having the Displayport issue with my PB278q as well, but I have a discrete GPU (GTX 660). My other ports connect Dell U2412M via DVI and HDMI to TV/receiver. The ASUS power button does nothing. My Dell always wakes up, though sometimes it reverts back to a default single monitor setup as if the ASUS wasn't connected at all.

I think the ASUS usually awakens if I manually set the computer to sleep. Though as I was writing this I checked my power settings, and computer doesn't auto sleep, just the monitors that turn off. Now I'll play with auto sleep/hybrid sleep to see if that works or the ErP settings mentioned earlier.

 

[exar333]

This happens to me from time to time upon sleep resume or boot-up. I am using a discrete 970 + LG display. I usually just reboot and it works fine. Have not tried HDMI as a alternate method because it doesn't bother me too much honestly.

 

[Aikouka]

I use DVI with my PB278Q, and I've never had an issue. I also use the DisplayPort for connecting to my work laptop, and while I don't use that nearly as often as my desktop, I haven't had any issues.

It'd be interesting to see if you can fix the problem by using an adapter. In other words, what happens if you use a DP->DVI adapter to use the DVI connector on the monitor? ...or how about using a DVI->DP adapter to use the DVI connector on the video card?

 

[Tiredrad]

I recently bought this monitor and had the trouble with no DisplayPort signal. From reading this and other threads, it seems to be an issue with the PB278 monitor. It sounds like in some cases it doesn't know when to awaken after it is put to sleep.

Initially when I first tried it out, I couldn't get it to receive a DisplayPort signal at all, so then I tried the VGA cable, and VGA worked (at 1920x1080). But then when I tried DisplayPort again it worked perfectly (full 2560x1440). And then it worked without issue for a few days through reboots of the laptop and power cyclings of the monitor. But then it hit again, and I think what happened was that the desktop power management feature put it to sleep. No sequence of rebooting, switching input modes, messing with the NVIDIA settings or re-plugging of the DisplayPort cable would bring it back. And then I remebered how it worked after I had tried the VGA, and doing that again (temporarily displaying through VGA) restored the DisplayPort capability.

I'm hoping that's the solution for whenever this happens, because beyond this nuisance bug, I'm very happy with the monitor.

 

[JACK BURTON]

I have 4 pb278q monitors connected to a AMD firepro V7900 card...had this setup for over a year. Turned my monitors off while I left the room for awhile, then when I got back to the computer, turned 2 monitors on, but one of them had the "no display port" signal.
I tried lots of things...(my displayport cables are only about a week old, as I recently replaced my older ones with new "approved" ones)...Unplugged and plugged back in the display port cable from both the problem monitor and video card, unplugged and plugged back in the power cord to the monitor, exchanged displayport cables with a monitor that was working, turned the monitor on and off several times, shut down the computer and turned it back on...funny thing, when I shut down the computer and turned it back on, I thought that fixed it at first, because when Windows was starting up, both monitors showed the "Windows is starting" message with the animated logo showing, but instead of showing the desktop, the problem monitor just went black with the "no display port" signal.
I finally got it to work except I don't know exactly what I did. I tried detecting it thru the windows display properties,...that didn't work. I tried detecting it in the AMD FirePro Control Center...didn't work, although at least it showed the monitor as part of my desktop and didn't indicate that there was a problem, while in the windows display properties, it showed my monitor as being disconected or deactivated, and when I chose to activate it, it wouldn't take...anyway, while I was in the AMD FirePro Control Center, I did a few things, like turn on all 4 monitors, (which I already tried previously but didn't help) and for some reason while trying different things, I saw that the display resolutions on most of my monitors was set too low and also one monitor needed to be reset back to portrait mode, so I fixed that using the AMD FirePro Control Center, and when I turned the problem monitor on I was suprised to see it showed the desktop. ...also, the monitor resolution was not the cause of the problem,..some monitors just happened to switch to a lower resolution during my troubleshooting episode....I don't know if any of that might help someone with a similar problem, but the problem seemed to get solved while adjusting settings in the AMD FirePro Control Center...also I think another important clue to the problem is that during the computer boot up, the "Windows is starting" message showed up on the problem monitor before it went black, which would seem to indicate it isn't a monitor problem, but something on the computer side.
I wouldn't be suprised if it happens again,...maybe my video card or mainboard or some other part is wearing out. If it happens again I hope it only happens when I'm trying to turn on the monitor, not while I'm in the middle of a work session or trading stocks.

 

[crossroadsglass]

I had the identical problem as Jack Burton and solved it by restoring my Win 7 64-bit to the latest earlier time. Both monitors booted up as they should. The only problem I experienced was that my Chrome browser would hang up and not start. So I simply uninstalled/reinstalled it, and all seems to be working fine. Weird. Hope that works for you too.:whiste:

 

[Atomic Playboy]

I have never seen a thread with so many "one and done" posters in it. How bizarre...

Anyway, I had a similar issue, and never really resolved it. As near as I can tell, DisplayPort has issues whenever a monitor loses the signal connection, either through sleep/hibernation, or because the computer was shut off. The monitor powers down and will no longer receive a signal until the cord is completely removed and the computer rebooted. I tried swapping out cables, using a DisplayPort/DVI adapter... nothing really fixed my issue. My grand solution? Shut off the monitor connected via DisplayPort when I turn the computer off. Works like a charm, and makes me feel like I'm working in an office circa 1997!

Seriously though, DisplayPort might be the most frustrating technology I've ever used. This is supposed to replace DVI? It's inferior in the most crucial of ways; it doesn't actually work. Losing connection to my monitor every single time I power down my computer and requiring a complete removal of the cable, reboot of the system and reinstallation of the cable is a solution to a problem that should never have existed, and never has existed with either DVI or HDMI. DisplayPort is utterly useless and I strongly caution anyone away from using it if they can possibly avoid it.

 

[AdamK47]

I own three displayport cables. One of them refuses to work with my monitor. The second one works half of the time. It will sometimes work on cold and warm boots. The third cable works every time no matter what.