Clevo X170SM-G dual channel problem

[SuperMG]

Hello. I bought a Clevo X170SM-G with 10900KF and RTX 3080 16GB with 32GB of RAM. It has the watercooling 2in1 heatsink.

 

Laptop wasn't posting so I reflashed it with a 1.07.04 stock clean ME bios.

 

Still no boot. So I had to remove the RAM from slot 2/4 and I only used one slot and it worked.

 

The laptop only posts with single channel configuration and it runs at 2133MHz.

 

The previous owner told me that the laptop was working perfectly fine and he didn't use it for a week and the laptop wouldn't post.

 

I cleaned the CPU pads. There were some stains but this didn't help.

 

Is the motherboard dead? Or is the CPU DDR controller dead?

 

All the memory slots are working in single channel.