Question Mining rig has no display

[Alex-z43]

This is a true mystery to me.
I have put a rig together with the following parts:
-6 RX 570 Sapphire Nitro+
-8gb ram Corsair 3000Mhz
-ryzen 3 2200g

• Corsair rm1000x
• Corsair cx 450m
• MSI B450M a pro max
• Kingston 120gb sad with hiveos

I have tested ALL of the parts individually on other machines except for the risers and the motherboard. At first, when I built the rig, I plugged only a single cards into the rig and the machine booted to hiveos just fine. But when I add the other cards, there is no more graphic output, wherever I plug the hdmi cable to. Also, when I try to revert to the system I had earlier with a single card, I does not output anything either. (Even if I remove the last gpu)
I am using the 1000w psu only for the cards and risers, and the second psu for the cpu storage and mobo. I also have a power splitter so that both of the psus plug into the main power connector of the motherboard.
My fear is that the motherboard was grilled by one of the risers, as this problem happened twice in exactly the same way with two motherboards I had.
Do you have any ideas?
thank you very much

 

[Ralston18]

PSUs:

Make, model, wattage (noted one being 1000 W), condition (original, new, used, refurbished)?

Did you mix and match PSU cables?

What power splitter?

 

[--SID--]

What exact risers and how are they powered?

How are the risers connected to the motherboard?

Ryzen 2200G is not a good CPU for mining because it only has 8 PCI-e lanes available for the PCI-e x16 slot.

 

[Alex-z43]

This is a true mystery to me.
I have put a rig together with the following parts:
-6 RX 570 Sapphire Nitro+
-8gb ram Corsair 3000Mhz
-ryzen 3 2200g

• Corsair rm1000x
• Corsair cx 450m
• MSI B450M a pro max
• Kingston 120gb sad with hiveos

I have tested ALL of the parts individually on other machines except for the risers and the motherboard. At first, when I built the rig, I plugged only a single cards into the rig and the machine booted to hiveos just fine. But when I add the other cards, there is no more graphic output, wherever I plug the hdmi cable to. Also, when I try to revert to the system I had earlier with a single card, I does not output anything either. (Even if I remove the last gpu)
I am using the 1000w psu only for the cards and risers, and the second psu for the cpu storage and mobo. I also have a power splitter so that both of the psus plug into the main power connector of the motherboard.
My fear is that the motherboard was grilled by one of the risers, as this problem happened twice in exactly the same way with two motherboards I had.
Do you have any ideas?
thank you very much

Update, thank you for your insightful advice, however, none of it worked. Setup update:

• replaced risers,
• different motherboard, cpu and memory
• only 4 RX 570 sapphire nitro

I successfully booted up 4 times into hivoes, but on the 5th time, same as before, system won’t post. This excludes:

• anything to do with bios, mobo, memory or cpu
• psu overload (only 4 gpus)
• faulty risers

I did notice that the riser pcie adapters were very flimsy, so I secured them.
Possible sources of the problem I can think of:

• voltage spikes when psu switches on
• RX 570 sapphire nitro draw too much power from pcie

As a reminder, each card has separately been stress tested. Any ideas?

 

[Flayed]

the risers are most likely the cause IMO

 

[Ralston18]

In addition to @--SID-- 's note regarding the CPU I will add another comment:

This GPU?

https://www.sapphiretech.com/en/consumer/nitro-rx-570-4g-g5-oc

What RAM ?

Two things to consider:

1) Stress testing has its purposes. And testing to destruction is one purpose. However if a stress test starts destroying the test subjects then people will not be happy. I am always in doubt of how much stress is really applied by some of those tests.

2) Power requirements: Provided that I correctly identified the GPU (4 GB RAM) the power consumption is 195 Watts. Recommended PSU is 500 Watts.

The 195 Watt value was probably determined under ideal conditions and likely low for most environment. If the Recommended PSU wattage is used then 6 GPU's require 1,500 watts. Four GPU's require 1,000 watts.

So with 4 GPU's the installed PSU is probably not able to meet sudden (power on) and/or peak power demands.

PSU is Gold rated correct? Its' wattage likely determined or established via ideal conditions.

My suggestion is to obtain a Kill-A-Watt meter (or similar device) to determine what the real wattage is.

Start with one card, two cards, etc.. Add cards one at a time making no other changes.

Watch the initial value at start up and also the wattage when the system stabilizes.

 

[Sam Carmichael]

I fixed this problem on a B250C by putting the compatible RAM in the right slot, making sure it's the right generation CPU, having the BIOS video setting where it's connected and using the right disk type (BIOS/MBR or UEFI/GPT which is newer) on your SSD/HDD that matches your motherboard's.