Not detecting all GPUs. Ethos & Windows

[UnknownTechGuy]

I have been trying for days to make it work, connecting it one by one(total of 6), separately. It detects at most 4(almost sure one time it detected 5).
Windows 10
Z270-A motherboard
RX 470 Graphic cards
Installed in uefi mode, enabled 4g decoding, changed speed to gen1.
Everything updated.

After days of looking around, decided to try EthOS instead.

Looks the same thing, detects 3-5 but when I get 5, it shows an error(something about soft luckup cpu). Only thing different is that it goes directly to mining.

Any help pointing to the right direction is highly appreciated. I already bought around 5 of this rigs, so hopefully is not any of the pieces. But if it has to be done, I can replace it.

B. Rgrds

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[nuanicaj]

is your power supply ready to handle that many?

[zij]

I had exactly the same problem until I updated the BIOS over the internet from one of the menu options in the BIOS settings.  It then all worked okay.