Question did I break my psu or my motherboard?

May 7, 2025
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3 days ago, my pc was running fine. I turned it on and it booted. It obviously didnt give me a signal because I didnt have a gpu or igpu. Then my graphics card (5070) came in 2 days ago. I turned off the pc, unplugged it put the gpu in the slot but then it only turned on for 1 second then turned off. Do you think its the motherboard or psu? I really dont know and I need this build finished now.
 
how do you know it is running if there is no signal.
full system spec? include brand and model of the psu
gigabyte windforce 5070
klevv cras c910 1tb
asrock b550m pro4
klevv bolt x 32gb 3600mhz
ryzen 5 5600
montech air 100
xpg core reactor II 750w
(just returned my psu and ordered a new one) do you think its the psu or mobo?