Question My gpu doesn't work !

Nov 26, 2019
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Guys i have 2 pc in my house. I stopped using one of them because i bought brand new pc so other one is sitting around. This day i wanted to open that pc but it didn't start. Everything is working fine, i checked everything and there is a problem and i cannot solve it. The problem is, i have AMD HD7870 in one pc and it doesn't start on my computer so i was thinking my gpu is dead but i put my gpu to my new rig and it works perfect. So i was thinking my motherboard was dead. I got my RX5700 card and put it into my old rig and it's working again. My old gpu works in my new pc but it doesn'T in older one. How i can solve that ? Im getting crazy