GA-AB350N-Gaming WIFI - NO POST with nvidia cards

[bxcounter]

I'm having a NO POST problem with nvidia cards on GA-AB350N-Gaming WIFI, any help will be appriciated.

MB: GA-AB350N-Gaming WIFI
CPU: Ryzen 3 1200 (stock)
Cooler: Scythe Mugen 5
Memory: 32gb (2x16) Kingston HyperX Fury Black HX424C15FBK2/32 / Crucial 4gb (1x4gb) BLS4G4D240FSE
PSU: Seasonic G-360 / Corsair SF600
GPU: Gigabyte 1060 3gb ITX / Gigabyte 1050Ti 4gb Low profile / Radeon 6450 1gb low profile
DISK: Samsung 960 Evo M.2 (250gb)

What has been tested with both nvidia cards:

NO POST (cpu and gpu fans start up, integrated led strip starts up).
NO video out (using DVI just to be safe).
Keyboard NumLock light does not work (tried various ports but no go).
CMOS reset and battery out – no go.
BIOS downgrade to older versions – no go.
Ram modules individualy in different slots – no go.
Change PSU - no go.
Remove Samsung 960 Evo - no go.
Change heatsink to stock AMD - no go.
Response form Gigabyte eSupport - still waiting (read - no go)

Build posts normally if i run it headless (without gpu), numlock light comes on and i can controll it's state (ON/OFF).
Only Radeon 6450 works in this build and with this card system is completly stable, stock or overclocked (cpu 3.95 and memory at 2933 - tested with Prime95 + Memtest86).

Both power supplys and both nvidia card have been tested and stressed on previous build:
MB: Gigabyte H55N-USB3 (s.1156)
CPU: i3 540 (OC at 4.6 Ghz)
Memory: Adata 2x2 gb ddr3 1600

...never seen anything like this.
Is there something in BIOS preventing these nvidia card to be initialized properly ?
Should i RMA the board ?

 

[Ketchup]

What card did you start with? UEFI may not like you changing cards after the initial install, especially if you have the extra Windows 10 options enabled in the BIOS (not exactly sure what those are for anyway).

Also, when you tried the 1060, were you using the extra power connection? Looks like it's the only card of the three that requires one, and might be easy to miss.

 

[bxcounter]

Of course the 6pin power connector was connected to 1060.
But 1050ti doesn't have power connector, same as 6450.

There is no disk/m2 connected to motherboard at this moment - i should be able to enter bios with any of those gpu-s.
CSM enabled/disabled , UEFI boot/Legacy boot - tried all that.
Only 6450 works.

Mother of all mysteries.

 

[BSim500]

Should i RMA the board ?

Honestly I'd RMA it. That you've tried multiple GPU's, PSU's, RAM, BIOS version downgrades, etc, is more troubleshooting than most people would do. I looked at this board recently when considering an ITX build and one thing that put me off Ryzen's altogether for Mini-ITX is the artificial crippling of the onboard Wi-FI for B350 boards. Despite having a 2x2 Wi-Fi dual antenna connections at the back, the board is locked down to only work up to 433Mbps (ie, it'll only use 1x1). For 2.4Ghz "N" it may also mean being locked to 150Mbps speeds instead of 300Mbps.

Why they do this I don't know but the same is also true of the ASRock Fatal1ty AB350 Gaming-ITX/ac. If you want 866Mbps 2x2 Wi-Fi (as dual antenna should operate at normally), you'll need to shell out for the much more expensive Fatal1ty X370 Gaming-ITX/ac board. A ridiculous restriction that even older Skylake B150's like the ASUS B150I-PRO GAMING WIFI didn't have. If you're planning to hard-wire it may not be an issue for you, but if you want to use Wi-Fi at all in the future, half-speed Wi-Fi is something to be aware of that a lot of people miss, but is right there on the spec page.

 

[bxcounter]

I know the Wi-Fi part is obsolete to a certain point. I don't use it that much so it's fine as it is.
I was under the impression that the wi-fi module could be replaced with better one ?

 

[RLGL]

I have a 1050ti and if I remember correctly it does have a power connector. I believe it is hiding. I would open my system to look, but to difficult to get at now.

 

[VirtualLarry]

The only GTX1050ti cards that I know of that have 6-pin power connectors, are the EVGA SC, FTW, and MSI Gaming / Gaming X.