I only have a DP monitor, so I don't know what happens with HDMI or DVI.
All I know is I get a "Diplayport No Signal" and a blank screen after POST if I do not enable Express Gate. With Express Gate everything works as usual.
 
Note that Express Gate is not meant to be a fix for this problem (it was just a way to browse the internet fast without needing to boot windows back in the day).
Enabling it fixes the problem for some reason that I do not 100% understand. I bet it has something to do with it starting some graphical mode before POST that must init the card in a different way.
In the end, I just know it works for me.
 
Edit: If I remember, I will try to take a screenshot of the option in the BIOS and how it looks when booting next time I restart my PC, just in case it can help someone.

kwikdane
Just bought an EVGA GTX 1080. Having the same problem. Single 1440, 144mhz display. I can get it to recognize the display with displayport only if DP is unplugged when starting up and connecting after a minute. Upgraded from a Radeon rx480 which worked, no problems. Motherboard is a Sabertooth X58. It does not have the Express Gate feature to turn on. To sum it up, I've tried Accel certified cable, Uninstalled all graphic drivers and clean install, cleared CMOS. Everything is up to date. I read where some have RMA'd the EVGA but never read a follow up on if the replacement worked. Trying to find out before I leap into a new motherboard /processor only to find out it was the EVGA.

hkanoz

kwikdane
Just bought an EVGA GTX 1080. Having the same problem. Single 1440, 144mhz display. I can get it to recognize the display with displayport only if DP is unplugged when starting up and connecting after a minute. Upgraded from a Radeon rx480 which worked, no problems. Motherboard is a Sabertooth X58. It does not have the Express Gate feature to turn on. To sum it up, I've tried Accel certified cable, Uninstalled all graphic drivers and clean install, cleared CMOS. Everything is up to date. I read where some have RMA'd the EVGA but never read a follow up on if the replacement worked. Trying to find out before I leap into a new motherboard /processor only to find out it was the EVGA.

Dooms87
Hi all hoping to get some help here. I just purchased a 1080 Ti and i'm having a issue i cannot turn my computer on without having a second monitor plugged into a DVI slot. My main monitor is a Dell Gsynch S2716DG and its been working great without issue with my 980 TI that i had prior to the 1080 ti. So as of now i'm not really sure what to do i use DDU and did a clean driver install when i upgraded to the 1080 but i can not get it to turn my computer on while its plugged in with display port. IF i have my second monitor plugged into DVI it immediately switches to the dell as soon as win 10 login appears.  Also i am able to get a Post and the bios quick menus before i get a black no signal detected screen.  Any advice would be GREATLY appreciated 

devildragon
Wow I am surprised I didn't find this thread earlier.
 
I am using an X58 Rampage III Gene board and have the exact same behavior with the 1080 Ti FTW3 card. Going to paste some of the stuff I typed to technical support just for info/input from you guys (I answered a question about pin 20 being connected or not, it was a lot to type so I just pasted it here instead of writing a whole new thing):
 
I have tested the following cards in my system (Asus Rampage III Gene, X58, I7-930, Acer XB271HU and tried with both a 750W (Newer) and 850W (original/olswe) power supplies):


MSI GTX 1060 Gaming X <--Non-Reference/Founders board
EVGA 980 SC
EVGA 1080TI FTW3

Both the 980 SC and the 1060 Gaming X successfully boot Windows with single DP monitor plugged into any of the ports on the card.


I can get a multimeter and get back to you with the results, but the 1m version of the cable I am using is listed on the database (I am using the 3m version).
(Accell UltraAV DP 1.2 Male to Male, forums removed my link)

I have also tried 3 different branded cables that came with different manufacturer monitors with the same results.


Labeling ports (picture of FTW3 Bracket from NewEgg):

The issue I am having and permutations I have tried:

• HDMI + DP3 = System will POST on HDMI monitor and successfully boots Windows.
• HDMI + DP1 = System will POST on DP1 monitor and halt before Windows Logo/Bootable media detection and screen turns off.
• HDMI + DP2 = System will POST on DP2 monitor and halt before Windows Logo/Bootable media detection and screen turns off.
• HDMI + (DP1 or DP2) + DP3 = System will POST on DP1  DP2, whichever is connected, halt before Windows Logo/Bootable media detection.
• DP1 or DP2 or DP3 = (Single DP monitor) System will POST and halt before Windows Logo/Bootable media detection.
• HDMI = System will POST and successfully boot Windows.
• DVI = System will POST and successfully boot Windows.
• DVI + (DP1 or DP2 or DP3) = System will POST on DVI monitor and successfully boot Windows.
• DVI + DP1 + DP2 + DP3 = System will POST on DVI monitor and successfully boot Windows.

 

On any combinations that successfully boots Windows with zero or more DP monitors connected, there are no issues plugging in additional monitors on DP or using the DP monitors connected during bootup at all after booting Windows.



On both the MSI 1060 Gaming X and the EVGA 980 SC in my system, both will POST and successfully boot Windows with one or two DP connected.


On another system (Asus X99 WS-E) both FTW3 cards will POST and successfully boot Windows with DP1 or DP2 or DP3 plugged in.

Nozler
I have to chime in also 1080 ti sc black, X-58 Big Bang XPower all updated bios and drivers. System will post np ,
but fails to load the os on Dp, monitor just loses signal. Hdmi np, but sense I can get the 144hz on hdmi 2.0 and
am going to upgrade to a UW soon I figured 144hz over hdmi was good enough hmmm. Will dp give anything 
Hdmi 2.0 will not?That still doesn't change the fact it won't show the os. Single monitor setup,but if I remember 
right there is a browser built into this mb also :/ I'll look into the bios some more.
Edit: I wonder if theres a connection between this post and the one below.
 

cloiselle1
The same thing happens with my 1080 and displayport.
 
it's something with nvidia's drivers and input detection.
 
it's the most annoying thing I've ever experienced. 

deezknuts
I have an Asus Rampage III formula (X58) with an 1080 Ti using DP connection and also have this problem booting into Win10 after POST.  It's so annoying.  The workaround is to unplug my monitor and let the computer boot into Windows and then turn plug the monitor back into the outlet.  Powering off the monitor did not work. It had to be unplugged.  Yea... effin weird.   So annoyed.

bukem
Have the exact same problem like @devildragon and @deezknuts. Asus Rampage III Formula board with 1080 Ti FTW3 card and can't boot Windows 10 when using any of the DP ports connected to two Dell U4210 screens. I've VESA certified DP cables from StarTech (DISPLPORT6L). They have 19 conducting pins as it's supposed to have (checked it with multimeter). I have tried all the combinations that @devildragon did, including connecting to different monitor and using other make DP cables, to no avail. Finally ended up with one screen connected through DVI and second through DP1.

yojack33
Just chiming in since I have been suffering from this exact issue with my 1080 ti Black and an old Asus P6x58D Premium.   My work around has been to pull out the display cable while power is off.  Boot.....windows loads normally....put back in display port cable and all is well.   If i leave the cable in during post it will leave bios and just go black with no windows boot after post.   Frustrating to say the least since it doesnt seen to be a motherboard issue since it posts fine and boots windows normally as long as the display port isn't connected.   Only using a single monitor btw.

Hi, I have MSI GTX 1080 Gaming X 8GB..When connecting with a DisplayPort cable, the screen darkens before the windows boot.
If I turn off the monitor and turn on the computer, no problem if I turn on the monitor after the boot process.
No problem with the HDMI cable, but the displayport cable is a must for gsync.
My processor and motherboard are old. i7 980x and asus rampage III extreme. Can this be the reason?
I tried them.
1- deleted windows and reinstalled.
2- deleted and installed the drivers with ddu.
3- changed the cable. I got a Vesa approved cable.
4- tried the old driver.
5- tried different Pcie slots.
6- switched off speed startup.

Waiting for all of your help.