PC powers on then powers off after a few seconds. Help pls.

Gashr · December 18, 2018

Specs:

Intel - Core i7-8700K 3.7 GHz 6-Core Processor
Cooler Master - Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler
MSI - B360 GAMING ARCTIC ATX LGA1151 Motherboard
Corsair - Vengeance LPX 16 GB (2 x 8 GB) DDR4-3000 Memory
Samsung - 970 Evo 250 GB M.2-2280 Solid State Drive
Samsung - 860 Evo 1 TB 2.5" Solid State Drive
Zotac - GeForce GTX 1070 Ti 8 GB AMP Extreme Video Card
Corsair - CXM 550 W 80+ Bronze Certified Semi-Modular ATX Power Supply

Problem:

When I flip the on switch on the PSU, the PC turns on and then turns off after 5 seconds or so. Everything runs, the fans and lights. No display shows up though, doesn't get that far. My motherboard has some "ez debug LEDs" and whenever I power the PC, the CPU LED turns on, the turns off, then goes to the DRAM LED, stays there for a few seconds, then quickly turns off DRAM LED and turns on the CPU LED for half a second before shutting everything off.

What I know:

My motherboard doesn't support overclocking but my unlocked processor should still function. My motherboard only supports max 2666Mhz DDR4 RAM but my 3000Mhz DDR4 RAM should still function at a lower clock.

What I have tried:

I have reseated the CPU various times, checked for bent pins(none found), cleaned CPU and reapplied thermal paste. Disassembled everything and put it all back together again. I cleared the CMOS various times. Tried all combinations of RAM slot occupation including using only 1 tested in each slot. Tried everything in and outside of the case. Cannot find any solution, the problem remains the same no matter what.

Please give me suggestions on what I should do next, I really hope nothing is defective. Spent 3 months working and waiting for all of my parts to come in and now this happens. I'm bout to kms.

Looked for hours around the web and can't find any solution so this is my last resort.

Will provide pictures if needed.