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Maximus IX won't first time boot

Level 7
I Have just assembled a Maximus IX with i7 processor, 16GB 3000MHz Vengence DDR4, Corsair H115i Pro water cooler.
The system will not go into first time POST.
When power is turned on the effect/mood lighting works, BIOS 1 light comes on along with the internal "START" button light and "RESET" button light.
Pressing the front case start, the internal start, internal and external reset, BIOS switch, Memory OK, SAFE BOOT and RETRY buttons have no effect.
I have also tried enabling LN2 jumper mode with no effect.
I have also tried removing individualr RAM modules and double checked the CPU installation.
I have also double checked all power connectors.
I am not using an M.2 SSD and have not therefore installed the adaptor board into the DIMM.2 slot.
I am lost for ideas and hope it is not a faulty mother board or CPU.
Any help would obviously be greatly apreciated.

Level 13
So no post, not even into BIOS?

First try clear CMOS and if still nothing....

Remove from case and try it on the box. Could be a short in the case. Also try a known good PSU.

“Two things are infinite: the universe and human stupidity, I'm not sure about the former” ~ Albert Einstein

Mabey a stupid solution but i have read it so many times. But did you check your stand offs? Are they all present? It might be a stupid thing to ask but you never know.
Success is the ability to go from one failure to the next without any loss of enthusiasm 😉

Level 10
I have the same issue with new build ROG Maximus XI Extreme 😕 I took battery out / clear CMOS , checked all connections, Tried bios update with USB it sits at AC code when it boots up no error beeps no nothing m/b lights up but nothing ever on my screen for bios. We removed video card tried on board video , tried 4 different screens , made sure L2 is enabled. Tried 2 different video cards , Checked all seta cables swapped them out no joy, reseat ram removed ram left one stick in A2 slot no joy. And cant even get into bios with onboard video. Beautiful build thinking at this point its a bad MB maybe. Full specs below. Any ideas and if I forgot to list other things we tried sorry my brain is freaking out at this point.
Case - Corsair Obsidian Series 1000D
CPU - Intel I9 - 9900K Processor
CPU Cooler - Hydro Series H150i Pro RGB 360mm Liquid CPU Cooler
Motherboard - ROG Maximus XI Extreme
RAM - DDR4 G.Skill Trident Z RGB 4266Mhz 32GB
Tested Latency 17-18-18-38
Video Card - ROG Strix OC 1080Ti OC 1708MHz
SSD's - Samsung 850 Pro X-Three-1TB
Power Supply - Corsair HX 1200i
Fans - Corsair ML120 Pro 120mm Premium x 16 (6 for CPU Cooler push pull)
Command Pro x 2
RGB Fan LED Hub x 3
Corsair LED Lighting Pro Expansion Kits x 2
Monitor - Samsung 49" CHG90 QLED Gaming Monitor 144Hrz 1ms
Bios 602 and did a bios update doh
passed 8hr test on Karhu RamTest
Set to Manual OC
Dram Frequency 4266MHz
Dram voltage 1.45v
CPU VCCIO Voltage 1.25v
CPU System Agent Voltage 1.29v
Dram timing control 17-18-18-38
Dram command rate set to 2N set dram current capability to 130%