PC Stopped Booting.

[LeGanondorf]

So I built this PC and it worked perfectly for 3 weeks without any issues. Then I was gaming one night and it suddenly turned off on me and wouldn't turn back on. I tried replacing the PSU, reinstalling the RAM sticks and GPU. I made sure all the cords connected in the motherboard were secure, and uninstalled and reinstalled all the front panel connectors. Still the same issue. The only concern I might have in this PC build is that the base of the heat sink was installed a little crooked where a corner of the CPU was exposed, but my friend who was there to help me build the PC assured me that it would be fine. Also, when it turned off on me, the lights on my keyboard and mouse were blinking faintly, like a dying flashlight before turning off completely as well. What do you guys think the issue might be? Here's my build:
Motherboard: Gigabyte Z270-HD3
CPU: Intel I5-7500 LGA 1151
Cooling: Cooling Master Hyper212 EVO
PSU: Corsair CX750M
GPU: NVIDIA GTX 1060
RAM: 2 Sticks of G.SKILL 8GB

 

[alexoiu]

Do the fans spin when starting the board?

 

[LeGanondorf]

Do the fans spin when starting the board?

No, nothing really works. Not even the motherboard lights turn on like it should. (Not a sound of any change happens when I hit the power switch)

 

[alexoiu]

Try clearing the CMOS *unplug the power cord and remove the CMOS battery for a minute). Start the board with only CPU and CPU cooler installed. No other components/fans.
If still no go, it might be a dead board.

 

[LeGanondorf]

Try clearing the CMOS *unplug the power cord and remove the CMOS battery for a minute). Start the board with only CPU and CPU cooler installed. No other components/fans.
If still no go, it might be a dead board.

Still nothing. You may be right, I'll just replace the board.