I try to setup my z370 ftw with superb 550 g3 power supply. Board outside, only cpu ram and power, nothing else. I try it with 8350k and 9900k. No success. Sometimes after 2 hours, it's booting with the 8350k. I made an bios update, change to 9900k boots up, build device in, test, no boot, device out no boot. I tried everything. I made a slomo video of the debug led. I don't get any video output, no bootloop, just debug loop. Does anyone now this issue? The ram it's gskill, it's in the compatibility list from this board, and I got an boot with all 4 dimms 32 GB. But booting up is 90% not possible. I tried other power supply same issue. Also if I power on the power supply, the board startyms immediately without pressing the power button. I have really no idea what to do. And I build a lot of PC's, I'm no noob at this case.

https:// youtu.be/v3Ab_Urb_K4