Question Newly built pc not posting into bios, help??!

Dec 11, 2021
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Specs:
msi z490 a pro
i5 10400f
Xfx thicc II pro RX 5600XT
1TB crucial p2 ssd

all I’m getting is a black screen, as far as I know the z490 and the 10400 f should be compatible out of box. The dimm slots are in 2 and 4 as stated on the motherboard itself…everything lights up when I turn it on…but I get nothing on the screen when connected to the gpu (because there’s no integrated graphics). Any possible ideas of what could be wrong? I’ve used this gpu before on my old build and it’s like new still…I’ve literally only used it for a month but I made this build for my niece and I’m stumped as to why it’s not showing the bios screen, or any screen at all for that matter.
 
Dec 11, 2021
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Update, it’s not the gpu because swapped it out with my current RTX 3070 and still no bios screen. I’ve also taken out and put back in the motherboard battery. I have yet to try a cmos jump but I need to get a jumper cap. So any other suggestions would be very helpful!
 

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