My old graphics card (HD 7870XT) had been going strong for 7 years but no longer displayed so I bought a RX 580. It worked for about 20 minutes in game (albeit very choppy) and then the screen artifacted and went blank. It won't display on boot like the old GPU.
When I remove a dedicated card and use the integrated graphics it boots. If I connect the RX 580 and force IGPU on the bios, it boots. If I connect the 7870 XT and use the IGPU it gets stuck on a bootloop.
Does this suggest that the PSU can't provide enough power? The 7870XT fans are running on boot even when stuck on bootloop were as the RX580 fans are idle when booted with the IGPU. The PSU is an XFX 850w bronze rated PSU but it is 7 years old.