Question PC no signal

May 27, 2019
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Hey guys so my pc been working fine till I got new fans I installed them and they worked but the pc didn't. it says no signal and it won't turn off unless I turn it off by the power supply .
I tried unplugging the motherboard battery , clearing the cmos , new video card , new power supply and new ram I even tried to use a new thermal paste but nothing happens . Is there a way to fix or am I supposed to return the motherboard .
My specs :
Motherboard : ASRock x370 sli ac
CPU : Ryzen 7 1700x
GPU : Gtx 680 (old one) , gtx 1660 ti (new one)
PSU : evga 650w (old one) , rosewill 750w ( new one )
Btw everything is new I've been using the pc for like 2 weeks .