I tried to install a new gpu into my outdated computer and had to buy a new power supply. I got one with PCI cables for the new GPU and it powered all the fans lights CPU and motherboard. I was never able to get a hdmi signal from the gpu so I tried a rga cord from the motherboard and it worked but once we removed the cpu and put it back in neither the gpu hdmi or the motherboard rga work. I tried with the old power supply and the old gpu put in. All the lights and fans work still. Maybe I just broke both my gpu and cpu but any help would be great. Also I don’t know the specs about my stuff because I don’t know anything about computers but my old gpu didn’t need pci cables but the new one did. Probably just broke something tbh.