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I added a new card for a
 total of 9. 2 AMD and the rest Nidvia. Everything was fine before. Max power is 70%, GPU clock 0 and memory +300. Two PSUs ♧. One 1200w and one 1000w. 8 GB of RAM.

Are you using windows 10? Have you checked if it got updated lately?  I have a feeling it messed up with your drivers

Tried sorting out the problem through deduction?

If you can afford to halt your operation, remove all the cards, one PSU and their risers.
Plug the newly added card to the best "working" riser and mine using only that card.
If the rig shuts down again, it's a bad card, if not, it's something else.

Better if you have a spare MoBo w/ components and a PSU for testing.

if rigs totaly shut down with no error its almost definetely PSU
i had similar problem even with reseter tool ... fan on 1 psu just stopped and it makes overheating of psu and his power-off overheating protection makes its job

and AMD and nVidia cards is realy great description :-D
you can have 2 vegas and 7 80ti and those psu you have are worthless ;)
so please, more specific list of gpus :)

Try removing the GPU you just added and let it run for a while to check if that solves the shutdown problem. If the problem persists then its most likely your drivers. Try doing a resinstall using DDU. I always install AMD drivers first before NVIDIA. Good luck mate.

I think same as it, maybe your last gpu to add have a problem ( not support driver ). Try to remove the last gpu and check or you can try only run rig with 1 gpu ( new gpu ).

Im with this guy. we need to know if you on the type of gpus you have. and also are using 110v or 220/240v outlets also. PSUs will say its for a certian wattage amount, but it has to be on the right voltage to give that much juice also.

I have spare risers and MOBO. I took the AMD's off line and it hasnt shut down yet. Its not blowing fuses because I've checked and the power outlet is still on.

I have:

2 AMD Radeon Rx 580's Saphire Radeon Nitro + SE

4 GTX 1080 Hybrid;s

1 1080 FTW3

1 1080ti FTW3

1 MSI 1070 ti Armour

How about my query above? ;)

It did up date I believe. DO you recommend I reinstall the drivers?

Is the "newly added card" AMD or Nvidia?
If it is one of the NVidia Cards, It strongly suggest that it's either the Riser, the GPUs wasn't properly distributed between the two PSUs or the PSU can't power an additional card.

If it is one of the two AMDs that you took off, you just basically reset your rig to the "no problem" state.

Do ya mean rebooting?
Have ya seen a blue crush screen?
Checkout device manager and how drivers for all card is working. Is it properly. Reintall if neaded.
Have ya installed some programm watchdogs? Be carefull with them.

It's not the mean of rebooting. It can be the course of not working some underpowered GPUs
But power balancying is not easy task it could be some problem. Even burning PCI-E ports

No connection with windows updates is here.  Most obviously problem - GPU drivers. Then - watchdog. Then PSU rebalancing.

yep, try to use DDU


Sir, updating of windows made the drivers messed up ;)

Actually not.  But better not to update windows if it works proppely I suggest.

Had the same on one of my rigs.
Changed everything, clean win install, ddu a few times, changed risers, tried with different psu, different GPU positions, nothing worked.

At the end it turned out to be a faulty ram module  ;)

If you use Window 10 and Awesome miner together you will be able to get this issue for sure. Please confirm that are getting the notification like collecting data and recovery failed. If this is happening you must need to swap the OS you are using.
I do not think that power supply is the issue for it.
You may check all the cables you have connected on the mother board because due to vibration some of the cables get loosen from the board dude.

Some suggested PSU, Riser, also about the updated window.

waiting for the @OP update on the issue, whether have already taken suggestions from each member to solve the problem.

It Actually is, If he is using an old version of drivers, he says on his first post, it was fine before

https://bitcointalk.org/index.php?topic=1921286.0

Some tricks to disable windows update

https://bitcointalk.org/index.php?topic=3034586.0

Then he just can update his drivers from vendors site.

always there was such a problem because of over-redrawing the cards, lower the parameters and you will have a stable work :o

When the rig shuts down or restarts it means 2 things.

1) There is a short somewhere and if you attempt to restart usually something will blow up or melt. If it restarts fine and goes to Windows then it means

2) You most likely have an overloaded PSU, it can mean the entire PSU limit or just a PCIe rail can be over current.

You need to look up specifications with your PSU and see if you are going over the limits. A current probe would help you out here.

Shutting down usually suggests a driver or hardware issue.
 You can check if it's the drivers by installing e.g. hiveOS (https://s.spool.cloud/hiveos) (https://s.spool.cloud/hiveos)) on a small memory card and running it for a while. If that crashes it is probably a hardware problem.

Nope, definitely not the driver.
Windows-based PC will display BSOD if it was the driver's fault for worst case scenarios, incompatible drivers may work but the performance will be too obvious to the user or wont install at all.
It's the Hardware as the first page post suggests.

Lastly, BTC22 (https://bitcointalk.org/index.php?action=profile;u=1406636) haven't bumped this for a while but he's active and minin' and probably solved this issue himself.
It's just this Jr member: honestinvestor (https://bitcointalk.org/index.php?action=profile;u=1688129) selfishly bumped this thread after a month of slumber which brings the "topic title" alive again.

If you mean totally shutdown and can not boot-up again, that's cause by short circuit.
But if it can boot-up again but then shutdown, that's definitely the last GPU or the riser inserted cause it.
- Please remove last GPU, and boot-up your PC.
- If normal, you can remove all GPU and try insert 1 GPU (indicated problem) without riser. If it's normal, tray again but use riser. If shutdown, that's definitely the riser cause it.
- But if you use GPU and riser and then normal, i think your PSU not enough to supply all your card.