Asrock z170 pro4s not posting

[arsaces_iii]

Hey there
Thank you for reading this
I bought a brand new Asrock z170 pro4s and I cant figure out whats wrong with this guy !
Power cords connected (24pin and 8pin), CPU Installed with stock fan , Ram Installed (on every 4 slots) but wont post/boot without any beeps and no video output(onboard hdmi port).
When I remove the ram , i'll get 3 beeps (means there is no ram) but with ram , nothing happens.
My memory listed as supported (Hyperx HX424C15FB/4) , CPU is listed as supported (Celeron G3900).
HDMI Cable changed, HDD Removed, CPU Fan removed, RAM replaced with my other pc, connected 4pin molex on motherboard , but none of them worked.
I changed the cmos jumper and did it again , nothing changed.
ps: everything is powered , cpu fan working , even if I add gpu they will turn on .
I found similar issue , and did what them all suggested , still no result ! also I checked the cpu and mb pins , everything seems to be fine.

Is there any solution or should I go for it's guaranty ?
Thanks

 

[amskuay]

So what I'm getting is it turns on, but no display, no post?

 

[arsaces_iii]

So what I'm getting is it turns on, but no display, no post?

Exactly

 

[amskuay]

have you tried plugging your display into your dedicated GPU? I've had an issue where onboard graphics doesn't work for whatever reason.

 

[arsaces_iii]

have you tried plugging your display into your dedicated GPU? I've had an issue where onboard graphics doesn't work for whatever reason.

Yeah I've tested it with a 1070 and a 980ti .

 

[arsaces_iii]

The problem was with ram , The Hyperx fury had problems and they changed it for me .
and my other ram which I tested with wasn't a supported by this model which made go wrong to find the problem.