Hello everyone, please let me know should you have any helpful comments! Thanks!

I am ready to get rid of this Asrocks board. It worked fine for 10 months, then I updated the bios (which was successful). After rebooting, the system now never posts and seems unable to be fixed.

AMD 1800X (now replaced with 2700X) CPU

Asrocks Taichi x370 MB

Corsair H115i CPU Cooler

Flare X 3200 - 16GB RAM

Aorus Gigabyte 1080 TI Vid Card

EVGA 850w G3 PSU

Phanteks Case

I replaced the motherboard with Taichi x470--system still would not post.

I replaced the PSU with another EVGA 850 G3 PSU--system still would not post.

I bought a 2700X CPU, swapped in--system still does not post.

The system goes through a boot loop. My keyboard/mouse lights never come on; no video output.

When I take the RAM out, I get 46 debug code with boot loop (no display, kb or mouse lights). When I have the RAM in, I get 00, dF, dE, Ad, 52, 08 codes (cycling through codes) and still the boot loop (no display, kb or mouse lights).

In my long history of building computers, I have to say, this has been one of the worst/most expensive experiences I've had. 

My only guess at this point is getting away from Asrocks products (trying a different motherboard with the new CPU).

Open to any thoughts/feedback. Thanks!

this post codes cycle loop means that your ram doesnt work with those timings mobo setting up

so u have 2 options here:

either get different ram or change some timings in your spd rom to make em compatible (can be done in linux)

what bios version did you flash

and

did you reset bios to the defaults before flashing

Now you need to look at the common components that are left. I do not envy you, I absolutely hate it when issues like this make you replace everything 

You are left with RAM, CPU and any remaining cables/accessories causing the issue. If you have a spare GPU I would try changing that out to test then see if you can borrow (with the amount this has already cost you I would try borrow before buying) some RAM to try. 

Good luck and let us know how you get on. At this point I can fairly confidently say it isn't your board or CPU, in all likelihood even the old ones were still good. Something else is afoot here.

Here's the steps:

1. Asrock replaced my bios chip - no fix

2. Replaced the Mobo - no fix

3. Replaced the PSU - no fix

4. Replaced CPU - no fix

5. Replaced RAM + New CPU - fix

(always resetting CMOS, etc at every step)

Not sure what happened with the bios update, but I lost my CPU and two sticks of RAM.

(I updated to Firmware 3.0 - had default setting prior)

(with the new Bios chip, I'm on the latest bios)

RMA-ing the CPU and the RAM....

a wild guess (and yes it can only be a guess)

was some corruption to the bios flashing at some stage

(could be writing file to stick or using file to bios rom, and could have been caused by unstable ram )

but it seems maybe some corruption occured

i 'think' bios v3 did have cpu microcode included so maybe that got bugged ?

anyway glad your back in business

(ive stuck with bios 3.1 for a long while its just right for my needs and cant see a gain for myself on any bios newer)