The Windows 7 DVDs will boot fine in UEFI mode, so if you want to test, try that. A Windows 7 flash drive, without modifications, will not boot as UEFI.
Your boot device menu should show the DVD as UEFI and standard. I even have the same Blue-ray drive.
Tomorrow, I will go get a Retail DVD and test it. If you want to try the Flash Drive method, I usually just use the diskpart version to make it and no extra steps are required. The Windows 8.1 DVD should have the correct file structure for booting in UEFI.
Have you tried using the on-board Display Port.
Well, the Retail DVD seems to be fine and does boot normally to UEFI. Unless you have one that is defective, we can rule that out.
During the boot, after you select the UEFI version of the DVD Drive, you will be immediately asked to hit a key to boot to the DVD. If you do not hit a key in time, the boot will continue to the Legacy version of the DVD. I have boot to UEFI or Legacy enabled, so if you have only use UEFI, it may do something else. Or if you have another bootable device, possibly it will attempt to boot to that. If you are not seeing the Hit a key message, try hitting one anyway and possibly turn off Fast Boot in the bios.
I have no way to test this with a 4 TB Hard Drive, so I can't help with that..... You might try using a smaller drive to test.
I can't think of anything else to check.
I also emailed ASUS to see what they had to say.
They had two suggestions:
1. Reset the CMOS
2. Try ACHI instead of RAID (I use Intel RST and a 64 GB Cache.)
I also set Secureboot back to "Other OS".
I did both of those, got a black screen still.
I rebooted one last time, holding down F8. I picked UEFI blu-ray again.
I saw the press any key to continue, and basically spammed the crap out of the keyboard since you said I had to hit it immediately.
Next came something I hadn't seen before - an ASUS screen with a swirly thing underneath it.
I waited for it to boot, and saw the same old two partitions in the windows 8.1 setup. Out of frustration, I hit "new" and it threw an error message. The display went from two partitions to something like six of them. I deleted all of them, picked the 4 TB partition by itself ... and 8.1 installed.
I've gone into disk management, and I see the EFI system partition.
I really have no idea what did it.
Oh, look there's the "Secureboot isn't configure correctly warning".
So you are up and running in UEFI and have the full 4 TBs?
The Secure Boot message probably means the Video card. If you have Secure Boot enabled, which you do by DISABLING the CSM, it will probably take you back to the Bios and reset the settings you need.
Again, unless your video card is capable, your settings should be CSM - enabled and Secure Boot - UEFI. I don't enable Fast Boot because I am old and like to take my time...
You also stated you had deleted some of the keys for the Secure Boot option, which don't even show up until Secure Boot is enabled. I have never gone that route, but if you need get them back, you might be able to re-flash the bios. I really like the power off flash option using the flash drive.
If you get a chance, you might get a snipping tool picture of your Disk Management and attach using the paperclip on the advanced replies.
If I understand correctly, you are using the Intel Smart Response Technology where you use an SSD as a prefetch? Anytime I do anything to my system regarding installing, I try to separate the SSD from the system prior to starting any such procedure. I will assume you had it disconnected during this trying period.
I was going to suggest you get a SSD 125 or 256 GB, to use as a primary drive and use the 4 TB as storage, but maybe your solution will work, but keep an eye on it.
Some video cards can be updated and some cannot, but if they are updated, you can disable the CSM. When I needed to update my video cards, the bios message would show up indicating such when it put me back in the bios. There have been a couple of Bios Updates since then, so it may behave differently. I had to update both of my GTX 680s from EVGA but it might also depend on the manufacturer as whether they want to supply a firmware update for the card.
I just got through doing a really clean install on my system using the Retail DVD as a source for the update. I am in the process of loading drivers on my system, such as the chipset and Intel ones. Whether this is necessary, not sure, but it does change some of the indications in Device Manger.
If Theog is reading this, my Winre.wim file was only 223 MB after the install, no need for a larger partition, System Imaging works.