Its crazy to me... this pc shows how much ram prices went down in a year. Over 50% reduction in price over 1 year time.
Its weird to take apart a system like that. Taking apart the old Pentium 4 system that was in the case originally was hard. Especially looking back on past technology.
I honestly felt bad removing the DVD readers especially LightScribe from the case to allow for cable management as they are IDE readers and unfortunately useless in this build.
Usually when diagnosing parts I try to isolate the part thats causing the proble,. Take out one component at a time and try to boot, record what happens and post it here. This does seem to be a CPU issue power or otherwise. That PSU does seem a little under powered for a 1080 and a 8700K but I dont know if thats the issue.
Id take out the ram and see what happens and try to boot it will fail, but see if it fails in a different way. If it fails differently then its most likely not your ram as it should stop at the ram check. If it is your ram it should fail at the same test. This test does not preclude a MB from being DOA but does help to check if its simply the ram.