motherboard slot

I am trying to build a computer with the old parts I own but when I turn the pc on it only stays on for about 5 seconds then powers off then turns back on then back off again in a cycle. The parts are 4 to 5 years old but when I built my new pc about 7 months ago the parts were working perfectly...

I'm just recently bought a pcie wifi card from ASUS (asus pce-ac68) and I'm trying to use it with an Asrock b250m-hdv while the 16x slot is occupied by a GPU (GTX 1050). When the GPU was installed, the wifi card wouldn't appear anywhere in device manager or settings while it was in the x1 slot...