Question Cant get new graphics card to work

Jun 28, 2020
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Recently my old GPU (GTX 780ti) has been all buggy with green lines and detects my moniter as being 1Hz. I figured it was done for so I decided to buy a new one (Radeon rx580) but nothing works.

so far ive tried plugging in the new card but i get no signal. I have put the old one in and tried to install the AMD drivers but it wont install anything cause it doesnt detect AMD hardware. Motherboard doesnt output anything either. im fresh out of ideas and need help