HELP! z390 Taichi ultimate Boot issues

Hi,
My problems have begun at the very first attempt of booting my new rig:

Cpu: i9 9900k
Ram Corsair Vengenance 2 x 16 GB 2666 mhz
mobo: as above
gpu: gtx 1070 asus turbo
psu Corsair 750 W (fresh)

cpu, mobo and ram are brand new just out of the box. My psu worked under heavier setup without any problems as well as GPU. However I have to confess, that during the assembly of my new pc I decided to disassembly the gpu, I cleaned the chip with isoprpyl alcohol and applied some thermal grizzly on it. I doubt that I could have damaged something but who knows.

Summary:

1st boot attempt resulted in a permanent boot loop. Computer was turning on and could only spin the fans for a half a sec and kept restarting infinitely.

I started to figure out, what can be wrong, so my first step was to remove one of RAM sticks and boom. System booted up. Then I wanted to make sure, that both RAMS are healthy, so I tried it on another stick, and it worked too. However It wouldn't work with both plugged it simultaneously.

The workaround? I moved them to A1 B1 slots and... ? It works! wow, like a charm. Ok, I move ahead, install the windows, drivers, updates, do a couple of restarts and everything works. (I did not power off the pc, only did some reboots.)

The problem returns after first complete shutdown. The PC starts to boot loop again. This time I had to remove the psu cord, wait for a few secs and I could boot it up again.
I checked, that my bios is outdated and maybe a possible upgrade could fix that issue, so I proceed to update my bios. I decided to run the uefi update through the windows, pc restarted and caught a permanent boot loop.. I think to myself I'm sc##wed for good... Brick...

It's been a while, I took literally everything off my rig except for 1 stick of ram and cpu, then after clearing the cmos I managed to boot up the pc using an internal GPU.

Then I updated the bios internally using the instant flash function and bios ver 1.80 loaded correctly.
I have inserted the ram (now into the proper sockets for the dual channel A2 B2 reffering to user manual) mounted the GPU, basically put everything together as I thought that the problem will be gone.. but another disaster was just about to come. Another boot loop occured after shutting down the pc.

Nothing helps. I desperately take out the GPU (some intuition) and it helps! This time my pc boots up with correctly plugged in RAMs but without the GPU. Okay then, so I decided to unplug the PSU, mount the GPU again, I cleared the cmos and... booted succesfully! What a surprise!

At this time Im thinking. Wow, it may gonna work! But nope....
another shutdown triggers the same problem. PC goes into a boot loop and taking out the GPU seems to be the only solution for that. After one succesful boot, I can insert the gpu and boot again, but when I shut down the pc, problem with booting up returns. Actually I can't even get it into a boot loop, it seems to be bricked for as long as I remove the psu cord and wait a while till all the current goes down from the capacitors. Unfortunately I'm away from home till wednesday so I can't even try putting GPU in another PCIE slot nor fiddle with the ram.

Any ideas?
I'm thinking that either my GPU is faulty and I have destroyed something while cleaning (but it does work when booted, doesnt lag in any game or heavy duty software) or the motherboard is having some PCI-e problems, as it can't power down properly with my GPU on place.

Please help me out since I'm pulling my hair our on that. I need my pc for everyday work and every day costs me a lot.

marjohn56 wrote: Dr. Debug not giving you any numbers? I have the 390 Taichi, not the ultimate, only time I have seen it loop like that was when I had incorrectly set the memory timings. I assume you have done a clear cmos and/or default UEFI ?

Yes, I've tried clearing cmos plenty of times. Whenever I try to change memory timings, which for some reason is at 2133 as default on 2666 mhz rams ( weird ), the system won't boot and tells me somee post that bios settings have been set incorrectly etc. I don't really know how should I set them up properly, I reckon I may be doing something not right.

What model number is the ram ? The exact model # is important.
To set the proper ram timing you need to go into BIOS and load the XMP 2 profile to get it to run at 2666Mhz. It is under OC Tweaker > Dram Config on page 62 of the manual for your board. Do not change any other memory setting, leave everything else alone. Try booting a few time with XMP profile loaded and NO external GPU, if it works fine then you probably damaged your GPU by stripping it down to clean it.

update:

1. I examined the CPU socket, since whenever I was inserting the GPU and plugging in the DP cable into it, the 00 code was appearing on the mobo immediately.
CPU Socket is flawless, and CPU is installed correctly. Left that case.

2. I was fiddling with the GPU as it seems to be guilty all of that mess.
When I insert GPU and attach the power into it, mobo is fine, pc can boot, everything works (monitors not plugged into gpu)
but if I shut the pc down and plug the DP cable into GPU, the code 00 pops up on the mobo and system won't boot. That thing does not happen, when I plug the HDMI cable into GPU. I can boot the system and use the gpu with the HDMI.

I went a bit further and took a look at the gpu. I see that the soldering next to DP ports seems a bit odd to me. Isn't it fried? I did have a problems with DP cables, as they were not contacting any my screens were making a strange electric sounds when I was moving the DP cables. Maybe they fried the GPU?
Tomorrow I will bring a spare gpu and plug it in using HDMI cables to look for a difference. Please take a look at the photos I attach, and tell me if the soldering looks ok? Or I'm just freaking out?