ASUS Z97 mobo freezing and video distortion in UEFI BIOS! Plz Help!!

Hello,

Firstly, my system specs:
ASUS Sabertooth Z97 Mark 1
Intel i7 4790K
Nvidia Geforce GTX 980, reference model
16GB RAM, 1600 MHz
512 GB Samsung 850 Pro SSD (OS X)
256 GB Samsung 850 Pro SSD (Windows)
LG 31MU97 (Monitor)(via DisplayPort for 4k @ 60 Hz)

Side note: I will be referring to UEFI as BIOS in the following quandry.

I have a bit of a problem...
Allow me to get straight to the point. I have an ASUS Sabertooth Z97 Mark 1 mobo. I purchased it to start building my first Hackintosh. As many of you may know, in order for a Hackintosh to run correctly, there are certain default settings in BIOS that must be changed. I had no problems doing this initially, and therefore, I was eventually able to get my Hackintosh up and running, however due to my limited knowledge at the time, I had some clover bootloader issues that I believe to be outside the scope of this question. Just for the sake of clarity, my Hackintosh was set up for dual boot. One SSD for OS X and another SSD for Win7 64-bit. Until now I've not really had the need to access OS X which is why I was semi-content with the aforementioned clover bootloader issues, wherein the clover bootloader would actually fail to post at all despite me setting the drive where it was installed as 1st boot priority. I would always boot straight into windows.

Now, I've said all that to say that to get everything working correctly I have basically decided that I will have to start over and install everything again on freshly wiped drives. As said before, I am very aware of the changes that must be made to the BIOS in order correctly run OS X. Unfortunately that is where I'm having a bit of a problem.

Every time I boot up and press del and actually manage to get through to BIOS(sometimes it just boots straight into Windows even though I'm pressing del like a maniac), everything just freezes. All I see is N/A everywhere, the names of my drives, the incorrect time and date, along with some mysterious and horrible video distortion(video does not distort at windows login). Any keyboard input results in nothing, and the mouse is just frozen in the middle of the screen. I also noticed that the "BOOT_DEVICE_LED" debug light is lit up on the mobo when the BIOS is in this frozen state, although the computer boots to Windows just fine(and even OS X when I disconnect the Windows SSD). So needless to say there is no way I can change the settings I need to for this Hackintosh to work properly.

It is also worth mentioning that my monitor(LG 31MU97) is plugged via displayport in a Nvidia Geforce GTX 980 reference model, on water. I shouldn't have to plug my monitor directly into the mobo when trying to access BIOS, right? Per some experiments, Ive noticed that the video does not distort when using HDMI on the GTX 980. So maybe there is something about displayport? Normally I wouldn't really care if I had to use HDMI, but I need 4k at 60 Hz pretty much all the time when on the computer, so it'd be pretty inconvenient just to have to plug in an HDMI when I'm changing BIOS settings.

Ive tried everything I know. Flashed a BIOS update(multiple times) using BIOS Flashback, reset CMOS, re-flashed GPU BIOS. I want to get the ball rolling for my Hackintosh, but it seems I'm at a standstill until I can get this BIOS situation figured out.

Sorry for my long-winded question. I just don't want to leave out any details.
Anyone have suggestions?

Thanks in advance

Distorted BIOS - DisplayPort->GTX 980

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Not Distorted BIOS - HDMI->GTX 980

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BOOT_DEVICE_LED debug light

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