Problem w/ risers at a z170a

[ItaCraft]

Im actually getting some trouble when i try to boot my rig, it gaves me a rainbow screen (See http://imgur.com/a/PSC2g )
I tested with UEFI, w/o uefi, with Gen1 option and w/o Gen1 option, also i tested with 4G Decoding too, didn't work
My rig:

• 7x RX 570 Pulse 4GB
• 1x z170a POWERX GAMING TITANIUM EDITION
• 1x HyperX Fury 4GB
• 1x Celeron G4400
• 7x Risers
• 2x CX 750 PSU
• And a SSD

Can someone give me a help?

[iamnoobplzhelp]

Does it work with 1 card? 2?3?4?5?

Try 1, then add each card. Where does it fail?

[phylton]

Does it work with 1 card? 2?3?4?5?

Try 1, then add each card. Where does it fail?

We are getting video on the onboard. So, basically, it's working with 0 gpus lol
Sucesfully installed win10, Teamviewer and some drivers, but cannot get screen when we plug a single Riser.

Its either Black screen for all the gpus, or sometimes the rainbow one for the first gpu

[iamnoobplzhelp]

Make sure to get 1 GPU going. Try and figure out what's going on with that. Make sure everything is plugged in correctly and turned on. Try different risers.

The GPU that you use should be plugged into the normal spot that you would put the GPU.

[phylton]

No sucess so far.. Can't get a single gpu to give screen.
We got screen onboard, and the Board Explorer says the x16 slot is empty, when the GPU is plugged directly in there w/o risers

[deadsix]

Did you flash the cards with the wrong bios? That looks like corrupted graphics card bios, and the only way that could have happened to ALL 7 CARDS is if you did it.

[phylton]

Did you flash the cards with the wrong bios? That looks like corrupted graphics card bios, and the only way that could have happened to ALL 7 CARDS is if you did it.

We could only run windows with the onboard.
The GPUs are brand new and haven't been modded. At no time the GPUs were acknowledged by the motherboard, so we didn't even get to biosmoding the GPUs.
Plugging only one gpu into the X16 slot, and the TV's HDMI to the GPU, gives that colourized "rainbow screen", and the Motherboard Explorer says the X16 slot is "empty".

could it be some sort of incompatibility with the MSI z170A Titanium edition and the RX 570 Sapphire pulse 4 Gb cards? Sounds very unlikely, but who knows

[phylton]

anyone? Any suggestion could help
thanks!