Have to unplug then replug monitor for pc to recognize after start up/sleep?

[Ddgamer]

Hey everyone,

So I have two screens that I have for my computer one which is a Samsung 28inch 4k monitor and a Samsung 55inch 4k tv which I use for my film making and photography.

Recently after purchasing the 4K tv every time I start up my computer or wake it up from sleep I am having to unplug the display port cable from my 4K monitor and then plug it back in for the computer to recognize it and I never had this problem when I had just the single 4k monitor. After plugging the monitor back in I then hear a connection sound the same one you get from plugging a usb in for example.

Another thing to note is that the tv is connected via HDMI and for some reason it defaults as the main screen for when I start the computer up to log in and it won't switch back to my monitor as default until I have unplugged the cord from the back of the screen and then plugged it back in again so the computer actually recognizes it.

Is there something wrong with my monitor? I have already replaced the cable and got a new graphics card under the warranty claim but this issue is still occurring.

And yes it is set to "Multi display performance mode" in the Nvidia control panel.

My pc specs are
Motherboard: Asus Sabertooth X79
CPU: i7-4820K 4-Core 3.70GHz
RAM: 32gb ram
GPU: Gigabyte Nvidia GTX 980ti
PSU 750W Corsair
OS: Windows 10

Thanks for everyone's help in advance!

Kind Regards,
Daniel

[_I_]

windows 10 has lots of problems with sleep
best to disable it and turn the pc off when not in use

[Ddgamer]

Originally posted by _I_:

windows 10 has lots of problems with sleep
best to disable it and turn the pc off when not in use

Yeah i've been doing that instead of sleep but the issue still keeps happening it really sucks. I'm wondering if it's hardware related or something to do with Windows 10. I mean the gfx and cables have already been replaced and I don't see what else it could possibly be.

[_I_]

make sure you have the latest drivers from asus, intel and nvidia
do not depend on microsoft having the correct drivers
ms takes a good guess but often gets things wrong, and mfgs rarely give ms the latest drivers

[Ddgamer]

Originally posted by _I_:

make sure you have the latest drivers from asus, intel and nvidia
do not depend on microsoft having the correct drivers
ms takes a good guess but often gets things wrong, and mfgs rarely give ms the latest drivers

Yeah done all that I do have a theory as to what it could be though. Since one of the monitors is connected via HDMI and the other via DisplayPort it could be possible that the computer is getting confused at startup and only defaulting to the HDMI. I am going to buy a HDMI to DisplayPort adapter to test if the computer works better with having two DisplayPort inputs rather than one HDMI and the other DisplayPort as inputs.

[[☥] - CJ -]

If you think that may be the case, have you tried only having One connected to see if it does the same thing?

[Ddgamer]

Originally posted by ☥ - CJ -:

If you think that may be the case, have you tried only having One connected to see if it does the same thing?

I unplugged the tv and just had the monitor plugged in and the issue didn't occur at all the startup screen came up on the monitor just fine. So it seems to get confused when both are plugged in.

[_I_]

could be the tv going to sleep and not telling the pc its connected

[Mr. Bubbles]

I have this EXACT same problem. I know this is an old thread, but has anyone ever figured this out?

[☠ ROUGHNECK ☠ Rico]

I've had this problem for about a year so if anyone comes up with something crazy plux let me know.

So far, sometimes restarting helps, waiting for ages sometimes works, changing from duplicate to extend to single monitor sometimes works. I usually just loop those until my monitor turns on.

The culprit monitor is a 4k display port monitor which feels like it might have something to do with the issue...

Specs:
Ryzen 2700x
32gb ram
Rx 580 8gb

I'll reply to this if I ever figure it out too

drivers are updated/tried rolling them back too

ty friendly peeps

[[☥] - CJ -]

And have you tried changing cables?
Poor quality/faulty cables can sometimes cause these problems with newer hardware

[SturmenDrang]

Just to add my experience to the discussion:

ASUS and IIyama monitors. displayport-HDMI cable.

Randomly, on resume from sleep (and sometimes on reboot), whichever monitor was plugged to displayport would fail to start up (totally blank) and the other two monitors would be the only ones available.

Impossible to activate the "dead" monitor without unplug/replug behind the computer at which point all is well until the next sleep/reboot (randomly)

Note the cable is supposedly 4K capable.

However all the monitors are 1080p.

Bought new cable. Problem solved instantly.

Hope this helps convince someone else out there to get a new cable or at least do some testing by swapping cables around.

[Out Of Bubblegum]

Did you specifically select the display-port monitor as the default monitor under display settings?

One thing I did with my two monitors. No idea if it helped. Attach the new display port monitor. Remove the hdmi cable from the video card. Just turning off the hdmi monitor or detaching the cable from the monitor is not enough. Get everything in Windows set up to run with that one monitor. Run all the programs. Then attach the hdmi cable. Then set up Windows for two monitors. Be sure to select the display port as the default monitor.