MSI 1060 6GB Armor 5/6 card are recognized

Hello,

I recently build my first mining rig, with x16 PCIe lanes and all, but only 5 out of 6 card are recognized my the bios and windows.

At first when i booted up the machine for the first time everything was ok....until i open the "Device Manager"and only 3/6 cards ware running fine, the other 3 had error 12 ( not enough recourses)
After some digging i found out that i must change the setting in the bios to GEN1 and TLOD to 3.5gb, and so i did.
The machine booted up normally but this time when i checked the "Device Manager" there was 5 cards running normally no error 12, nothing. But the 6-th card was not recognized, like there was no card installed to the MBO. I checked in the "System Browser" from the BIOS and in the 4-th pci slot it showed nothing like the card does not exist.

Cheklist:
I thought that the card is dead, but when i boot up the machine, the fans on all cards are spinning normally.
Checked the pcie lanes but they are fine too.
Updated BIOS...same thing
re-installed drivers..no luck

I'm running out of ideas.....

If anyone has any idea how to fix this. It would be very appreciated.

Here is the rig:
MBO: Asrock z170 Gaming K6
CPU: Intel Pentium G4500
Ram: x1 4GB DDR4 Kingston 2400mhz
PSU: x2 1200W RAIDMAX RX-1200AE-B
GPU: x6 MSI 1060 6GB Armo