Pull board from case and place on cardboard. Have cpu, cpu cooler, gpu, one stick of ram and hatddrive and see if it works to rule out short or bending of board in case. You have another psu to try? Any codes it stops on?
Maximus XI Formula, I9-9900k, Phantex Evolove X, Seasonic Titanium 850W, Custom loop PE360+SE360 Rad, G.Skill Trident Z F4-3200C14 32g, Nvidia Reference RTX 2080 TI, Samsung 970 EVO Plus 1Tb, Windows 11