Hi
I assume your issue started after you transferred everything to the new case and all your components were working fine in your old one for quite some time.
So its obviously tied to something you have done accidentally. Stuff happens, don't worry, I once literally stepped on and cracked my mobo in half while I was laying out my components. Amazingly it continued to run, even cracked for about 3 years after that.
Things I have ran into in the past that caused me bootloops and various other boot issues, none of which were on Asus mobos, but may be applicable here:
1. Often I connected my power switch, reset, pc speaker, etc. connectors on wrong pins. I no longer have good vision, and mobos often have pins in different spots, so its easy for me to mix them up. So unplug your power switch or rather whole front panel of switches etc., double check the manual for which pin is which and make sure they are on correct ones.
2. Twice, the back of the board made contact with case. This was bad, I was basically shorting stuff out, luckily not long enough for anything to actually burn out or get damaged. Once I had to resort to a local trip to Fry's Electronics to actually buy risers because I didn't want to wait for an order to come in.
3. Happened once, weired and unique hardware combo: This was on a Gigabyte board + a quiet smart fan. Turned out to be a hardware compatibility issue. Basically, I was using a larger fin but slower fan, while the BIOS settings in my mobo were set to and expecting a certain minimum RPM which the fan needed to hit within X amount of time (like 1-2 seconds) when the computer was being started. But because the fan was designed to run slower, the mobo working as intended thought it was faulty based on the lower RPM and rebooted to check it again. If you are using a cooling device with such tech or features in it, or one of your fans is dirty on or around the bearing etc. causing it to run slower, this may happen.
Other then that, in addition to whats in the video, I would unplug, clean all the pins, and replug everything, not just the RAM, GPU and peripherals, I do mean everything. Especially all the case fans and power supply. You could have an arcing pin on a connector somewhere, or something like that.
After you take out your board and re seat it, plug nothing to it except your graphics card, CPU Fan and power supply to the board, the GPU, see if you can get into BIOS. Like in the video, try it out on 1 stick of RAM 1st. See if it boots.
In case your BIOS is corrupted and you don't have a dual bios board, if I remember correctly, the Sabertooth boards come with an option to boot from and use BIOS from a USB stick and there is a procedure for it in the manual. I forgot exactly how to do this, but its there. You will need a formatted USB stick (I think its FAT 32 but not sure) and obviously a 2nd machine of some sort (maybe able to do it via your phone, depending on what you got) and read the manual, then download the Asus USB BIOS utilities and files for your board and follow those instructions.
Also, on I have heard on rare occasions CPU thermal paste getting under a pin and causing various issues bootloops included. So you may want to check into that. Remove your CPU, clean off all the thermal paste, get new one.
Other then that, since you already tried everything thats in that video, I really can't think of anything other then swapping components. Start with the PSU, doesn't matter if it won't handle your games and load, just check if it boots, then RAM, check your GPU. Since you're on AMD you need to be 100% sure about your GPU because you don't have the option of plugging into your integrated graphics.
Unplug your water cooler and plug in another fan, do this with case open and possibly a table top fan blowing on your computer. Again, do not worry about overheating, you just want to see if it even boots. If it does, then shut down promptly, don't keep it running.
Its a lot of work, but if you actually do all this and it still doesn't boot, then you have either bad ram or bad board or bad CPU. It could be the GPU too on AMD based system, so I would check that 1st. Plug in an old GPU into your current board and see if it boots, or take yours to a different system and see if it works.
Hope some of this helps.
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