Question System Won't Post. Solid Orange LED on PWR, Red LED on CPU (Mrk 1 TUF Z270)

[Darjo35]

Upgraded my computer and used a mix of old and new parts. When I turn on the system, I can see the fans spinning on both the cooler and the GPU.
Things I've tried:
Unplugged and firmly replugged connections to motherboard: No Post
Swapping Ram/ Using 1 stick: No post
No GPU: No Post
Swapping PSU: No Post

There is an Orange LED on the Power and a Red LED on the CPU. The CPU is my previous 6700 I7 on my old build. When I took it out of my previous build I saw nothing bent and made sure to wipe all of the residual thermal paste on it before applying a fresh coat. I have gone through the previous checklist posted on the sticky threads to no avail. Any ideas if it's a problem with the motherboard or the CPU?
Edit to include system specs
CPU: I7 6700
GPU 1070
Motherboad: Mark 1 TUF Asus z270 (New)
PSU: Corsair 750 rm (new)
Ram: Old 32gb ram DDR4 / Swapped with new DDR4 4gb ram 2800
Cooler: H100 Corsair AIO

 

[Zizo007]

List your system specs.
I assume your new components were brand new.

Make sure you plugged the power cables to the GPU and that the CPU 4 or 8 pin power cable is plugged to the motherboard (Not only the big 20+4 pin multicolored cable).

 

[Darjo35]

List your system specs.
I assume your new components were brand new.

Make sure you plugged the power cables to the GPU and that the CPU 4 or 8 pin power cable is plugged to the motherboard (Not only the big 20+4 pin multicolored cable).

I have updated the thread with system specs for clarification. Yes, I have plugged in the 24 ATX to the motehrboard, 8 pin to the GPU and the CPU power at the top of the motherboard

 

[Janch]

Im fighting the same problem today. Except its Ryzen build.
Good luck and ill let you know if something helped me on my issue. Maybe it will help you

 

[Darjo35]

Im fighting the same problem today. Except its Ryzen build.
Good luck and ill let you know if something helped me on my issue. Maybe it will help you

Same here. I think I've narrowed it down to a CPU or motherboard problem.

 

[Janch]

Same here. I think I've narrowed it down to a CPU or motherboard problem.

Mine booted after i took everything apart and put it together.
Then once it didnt post, i put in different GPU (you dont need as you have intel) and removed battery and then it booted.
I dunno. Guys tell me to try different PSU as they say mine is crap although my brother has one for almost 10years and still works fine.