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I had a similar issue with a ASUS TUF B450M. My build was working perfectly for 3 months after assembling it (all parts were new), suddenly I had this issue were PC was working perfectly fine at night and next morning it failed to post, jumping the mobo wasn't doing anything... 5 or so hours later it was working ok again. This repeated about 4-5 times within the next month. I sent the mobo back to Asus and the conclusion was a factory defect. Maybe you can try turning it on with the minimum components and see how that works.

Hi everyone, this is my first topic here so I'll try to explain myself as best as I can I assembled a PC in january this year, everything worked great but I started to have boot issues with screen not even displaying anything and at random. The issue was a factory defect with my mobo, so I got a new one (AORUS X470 GAMING 5), wich worked great for 5 months. So one morning I turned it on and a super loud fan noise kicked in, I couldn't identify wich one was but the RGB were on and I had nothing on the screen, as it did not post I tried turning it again, nothing happened (the fan issue did not repeat in tests after this). With this in mind we conducted several tests in a local repair shop, we tried most of my components in another PC and everything seem to work ok (CPU, PSU), but nothing worked on my side. Apparently the mobo was still conducting electricity because when we unplugged the 8pin connector the fans and lights were turning on. At this point we think that it might be an issue with the 8pin coming from the mobo, but we're not sure. I'm afraid that the PSU could've killed the mobo but I have no proof of that. Any help would be appreciated SPECS OS WINDOWS 10 PRO 64bit CPU Ryzen 7 2700 GPU Asus TUF GTX 1660Ti RAM 2 X 8 GSKILL TRIDENT Z 3000 MHZ MOBO AORUS X470 GAMING 5 WIFI PSU EVGA 700W 80PLUS GOLD SSD XPG GAMMIX S11 PRO 512 GB (BOOT) HDD BARRACUDA 1 TB Thanks, Alex