[SOLVED] Damaged Motherboard or Processor..???

[WarXMachine3]

Yeah, This Begins when I was just try to run my PC like rest of the days, This time when I push the Power Button my PC started but the Motherboard wasn't detecting the CPU, I gave it to the Service Center they got my Motherboard Fixed, Everything was working fine for few days but one day I tried to Open the PC I pushed the power button Boom Nothing happened no signs.
I gave my Motherboard as well as my CPU to the Service Center Intel replaced my CPU and the Gigabyte workers was Saying that the Motherboard is working fine they are not gonna Replace it and When I got the Motherboard back I turned it on the PC was working fine. But after few days the same happened again with the new Processor..!!!
Mobo- Z370 gaming 5
Processor- i5 8400
Ram - corsair 2333mhz
PSU - VS450

Please tell me is the Motherboard is faulty and they lied to me that the Motherboard is working fine and we are not gonna Replace it..!!!!
Or Anything else is making the Problem...!!!

 

[Blitz Blitz]

Get back to the center until everything works fine

 

[WarXMachine3]

Get back to the center until everything works fine

My component and Setup

 

[WarXMachine3]

Get back to the center until everything works fine

The GIGABYTE Service center