Erin W,
customer service rep I believe.
 
This guy is a Godsend.
I do not know him and this is not a joke.
I have been dealing with Nvidia level 2 and Samsung level 2 and 3 support for well over a month now,
because my 4k Samsung was not working in 4k. It would blackscreen on me when I went into any 4k res.
I have spent hours and hours and hours dealing with this.
I have pulled my hair out and bled inside this computer over this..
After going through owning my gtx 680s and getting no solution then upgrading to the 9 series and still getting no help
At the end of my rope. When I had finally lost all hope and given up.

Swear to God I was feeling defeated like this, trapped with zero hope and no help:youtube.com/watch?v=9qN8dCmN08o
 
Anyway,
I got an email from EVGA so I decided to call them up.
We start running through the basics, try one card at a time etc. 
Then Erin W tells me that maybe I need to enable UHD colors..
UHD colors? huh? O.o?!
NEVER,
not even ONCE,
from dealing with all these people who call themselves "professionals" in tech support, did ONE single person even hint at such a thing.
My problem is solved and EVGA has a lifelong buyer now. My mobos, my gpus, hell, if I need a blood transfusion, I'm getting it from EVGA!
You guys Freaking rock!
Now I feel more like this:youtube.com/watch?v=xsUGU-49I1I
 
 
a hurricane, I got sli gtx 980's in 4k!  o7
 
solution to new problem added:
I found the solution to the input loss of signal problem, after changing HDMI inputs.
I'd watch TV on HDMI 1, then switch back to my PC on HDMI 2 @4k and would get no signal.
 
Amazing how much Samsung kept trying to tell me it was the GPU.
I had to literally tell three people that they were not qualified to help me.
 
Anyway one of the guys in like level 3 support? Iunno.
I had to leave a call back number for this escalated guy to get in touch with me.
He was completely clueless and admitted it. 
 
He just blindly threw it out in the air to try resetting factory defaults and it worked.
He was just as surprised as I was.. lol
 
From the sound of it, it is a good idea to reset factory defaults on any samsung tv, before you start playing with it.
and definitely after a firmware update.
 
It will not revert to an older firmware.
It will just be like resetting cmos for certain new hardware.
It's a good idea and absolutely necessary, to access some of the TV's settings and fix some problems.
 
It may take up to 30 seconds with the "no input" message on the screen, before the screen actually comes on, when you switch HDMI ports.
So wait for it.
 
EDIT: it stopped working again in random cases.
 
Also here is an additional topic on the subject, I find extremely educating and very important.
http://www.amazon.com/rev...an%3E%3C/blockquote%3E

D-007
My problem is solved and EVGA has a lifelong buyer now. My mobos, my gpus, hell, if I need a blood transfusion, I'm getting it from EVGA!
You guys Freaking rock!
Now I feel more like this:youtube.com/watch?v=xsUGU-49I1I
 
F@*! a hurricane, I got sli gtx 980's in 4k!  o7

Lol. I felt the same way when I spent a week trying to figure out my motherboard issues on my first z77 FTW. Sure its a different story, but I was on the phone for 4 hours, at 3am in the MORNING, and some poor sap named Matt was on the other line, (bashing his head I'm sure) helping me resolve my issues. And they did :) I've never seen a company this great!

 
Good job EVGA Erin.
 
 

I have relayed this feedback on to EVGA. Thanks for your very kind comments.

Hi D-007,
 
Thank you for your positive feedback on your experience and I will make sure that Erin also sees this thread and that it is added to his feedback. chrisb@evga.com 

New problem and solution to the problem added.

WolfeMacleod
Having a similar issue with a new Vizio P-series, 55" running a GTX970 card.   Nvidia control panel will not even give me the option for a 4K setting at 60Hz.   30Hz, going downward to 23hz.     Doign a customr esolution and tryign to force a 60hz give me a black screen.  
 
  Vizio has requested screenshots of the Nvidia control panel, Dxdiag text files, etc... 
 
  HDMI cable is a Rocketfish RF-HG08501 - 18Gbps, 4K/2k, up to 240Hz according to the packaging. 
 

 
 
There are TWO sections in resolutions in nvidia control panel.
The first section is "Ultra UD, HD, SD" and those run at 30 hz.
Do NOT choose those resolutions.
 
Just below that are "PC" resolutions. Those run at 60 hz.
Select the 4k resolution, from the PC Resolutions section, at the bottom of the list.
 
I hope that helps.

WolfeMacleod

D-007

WolfeMacleod
Having a similar issue with a new Vizio P-series, 55" running a GTX970 card.   Nvidia control panel will not even give me the option for a 4K setting at 60Hz.   30Hz, going downward to 23hz.     Doign a customr esolution and tryign to force a 60hz give me a black screen.  
 
  Vizio has requested screenshots of the Nvidia control panel, Dxdiag text files, etc... 
 
  HDMI cable is a Rocketfish RF-HG08501 - 18Gbps, 4K/2k, up to 240Hz according to the packaging. 
 

 
 
There are TWO sections in resolutions in nvidia control panel.
The first section is "Ultra UD, HD, SD" and those run at 30 hz.
Do NOT choose those resolutions.
 
Just below that are "PC" resolutions. Those run at 60 hz.
Select the 4k resolution, from the PC Resolutions section, at the bottom of the list.
 
I hope that helps.

 
  Yes, I'm aware of that.    4096x2160 is limited to a 24Hz refresh only.  Between rez and 1280x800, there are no resolution possibilities.  1280x800 will refresh @ 60hz. 
  The highest rez setting that will give 60Hz is the 1920x180 listed under UHD,HD, SD setttings.
 
 

Shot in the dark but you might try another HDMI port, if you haven't.
I noticed that one of mine, won't run 4k res.

WolfeMacleod
 

D-007
 
 
Shot in the dark but you might try another HDMI port, if you haven't.
I noticed that one of mine, won't run 4k res.

 
 Tried 'em all.   Only one, though, is supposed to support  4K @ 60hz.

Dam.. 
I have been noticing that when I switch HDMI ports, even now.
Sometimes it just doesn't work.
Even after the fixes.
Samsung needs a firmware update, big time.
I expect better out of a company, that acts like it is the best at what it does.
 
A lot of these 4k sellers blatantly mislead people. Watch out.
I have heard a lot of people telling me they got stuck with a 24 hz TV. I'd return the TV asap.
Their tech support will run you though circles, until your time to return the item runs out.
You should absolutely see the 4k res's.
Even if they don't work, they should be listed.
I think you got one of those TV's possibly.

x3sphere
My HU8550 does 60 Hz/4K on all ports, but the color output is limited to 4:2:0 even though I'm using a GTX 980.
 
I'd advise not buying a 4K Samsung until they fix it, unless you are fine with 4:2:0 output (personally I'm not as I planned on using this is a secondary monitor and text quality looks terrible). Ongoing thread over at the Nvidia forums on this here:
 
https://forums.geforce.co...4-4-4-full-rgb-output/

Mine is an older model and the text looks perfect.
I'd consider that it may need a firmware update.
 
I saw your post and I see you have tried most things..
What I'd of said to try would be.
Try HDMI 1 or 2.
My HDMI 3 won't work.
Try DVI or DP.
Verify firmware version.
Verify windows display settings, say the same thing that nvidia control panel says, for refresh rate and res.
Mine was different for some reason.
Had me at 59 hz in windows and 60 in nvidia.
I changed it to 60 in both.
Try a reset factory defaults.
Default pin number should be 0000.
Make sure you have no hdmi cables plugged in, when you enable UHD color on those ports.
 
I bet you tried all, if not most of those..
 
If you get it fixed, please do let us know. 
I know how sincerely aggravating it is to deal with the "professionals" and then realize most of them, have absolutely no idea what so ever.
The run around is the pits. Good luck man.
 
My blackscreen issue is also back when I switch HDMI ports.
Called Samsung about that and they have someone calling me back.