Weird screen issue

[XCalinX]

Hey guys, I have a 1800X, A Gigabyte AX 370 Gaming 5 board and 2 GTX 1080s in SLI.

I had an Acer 4k monitor that was hooked up with a Dispaly port cable. Then I won a Samsung 4K TV on a giveaway and decided to use it as a secondary monitor to play racing games on. I plugged it with a HDMI 2.0 cable. It worked but I noticed that after I plugged in the TV for the first time that I can't get into the BIOS anymore, even if I use the monitor with the DP port. Basically the PC boots, it detects the CPU and RAM, but the screen stays black instead of showing the BIOS splash screen(on both the monitor and the TV) and it only turns on when I'm at the Windows 10 lock screen (not the boot logo, but the lock screen) so by the time I get signal on the screen the OS is already loaded. I don't know what to say about this. I tired to reflash my BIOS and reset the CMOS and none of these things helped. I don't really want to take the GPUs out because they are custom watercooled with rigid tubing so it is a bit of a pain in the ass.

[MrMarriarty]

if you unplug the new samsung TV and use your old display does it come back?

 

EDIT: I ask because my smasung TV does not play well with my bios... id love to know why though, its ok on any other display i use

[XCalinX]

24 minutes ago, MrMarriarty said:

if you unplug the new samsung TV and use your old display does it come back?

 

EDIT: I ask because my smasung TV does not play well with my bios... id love to know why though, its ok on any other display i use

No,

But I fixed it shortly after writing this thread :P. I've been dealing with this for a few weeks and finally managed to find the solution today.

For some reason one of the cards had a higher priority while loading the BIOS while the other one had a higher priority in the OS. I forgot to mention in the OP that if plug any of the 2 displays into the first GPU (I was using the second one), I won't get signal at all. So I found out that the first GPU only displays signal prior to the OS being loaded while the second one only displays signal after the OS is loaded. When I discovered that the other GPU doesn't display signal, the PC was on and the OS was loaded and I didn't bother to reboot it. 

So, as you can guess when I plugged the cable into the first card and rebooted, the BIOS screen showed up, but after that the screen went black and when I moved the cable back to the 2nd card it was displaying the OS.

The fix to this was to disable SLI, move the cable to the top card and then enable it again. 

What I don't understand is why this started happening when I got the TV., since I didn't make any hardware changes to the system since before I got it.