Hi There

I have a weird error with my Asus Prime Z270-p....

The rig was running for a while with 6 gpus on it, but yesterday it crashed and at boot it said windows startup was corrupted so i've freshly installed w10.


Now the problem is:

I can get 3 or less gpus running if one of them is connected to the first PCIE16x slot, more then that the bios appear and black screen after
BUT
I can get 5 gpus running IF the first PCIE16x slot is NOT used, more then that the bios appear and black screen after

I've tried multiple combinations of GEN1-2 in the 3 different place of the Mobo BIOS but I can't get it to work.
I've also tried to downgrade the bios mobo to V0812, testing 6 gpus was unsuccessful, I've switched it back to the latest Version and I can't use the first PCIE16x slot....
Also, I've tried different combinations of order for the gpus, they all seems to work fine.

Have any idea? Do you think the Mobo is fried or something ?
Thank you VERY much!


Info Update:
-Clear CMOS: Done multiple times
-Booting with only ONE gpu connected via risers to the first PCIE16x: Working
-Running BIOS version 1002