Question Ok so I just received my new pre build PC in the mail I can’t get signal with it. If I hook it up to the mother board it runs off of the processor gpu

Sep 25, 2021
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Ok so I just received my new pre build PC in the mail I can’t get signal with it. If I hook it up to the mother board it runs off of the processor gpu. Also had my uncle take a look at it he couldn’t get a signal with it he put his gpu in it and it worked. Is there anything I should try it’s a 3070 to GeForce RTX AORUS