Question PCIE Didnt detected GPU but its powering it up

Mar 5, 2020
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I just bought Sapphire RX470 4GB OC
when i connect it for the first time it works
but the fan spinning so fast, im afraid to continue to use it and try to replace the thermal paste that turned out to be dry af.
after i change the thermal, i connect it again and its powering up, the fan spin and the backplate generates heat like normal GPU
but in my display its not detected but when i connect the HDMI directly to the motherboard, i realize that PCIE Slot didnt detected my GPU but why its powering it up?
and yeah, i did open it but very slowly and gently.
theres no shorts ( because if there is any shorts it wont turned on right?)
i think something missing here :' but which one :'
i need fast reply :'
 

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