PC won't turn on

[vipringd]

Hey! I built my PC about a month ago, and it has been working perfectly until yesterday.

I left the PC in sleep mode for a few hours, and when I came back I saw the leds on the front of the case blinking as they usually do when it's in sleep mode. The only problem was that when I clicked the power button, the PC wouldn't turn on again from sleep mode. Holding it in didn't turn the LEDs off. I had to use the switch on the back of the PSU and unplug it to get all the LEDs off. When I plugged it in again and switched the PSU on, it wouldn't turn on using the power button on the case.

When I plug it in and switch the PSU on, there are a few LEDs coming on, some on the GPU and some on the motherboard. The fans do not start spinning after clicking the power button on the case.

So I'm just wondering where to start.

CPU: i7-7700K
GPU: ASUS ROG Strix 1080
MB: ASUS ROG Strix Z270F
RAM: Corsair Vengeance 16GB
PSU: Corsair RM750x
CASE: Corsair Crystal 570x RGB

 

[vipringd]

Forgot to mention, I have already tried shorting the power sw pins, and that didn't turn it on either, so it's not a broken power switch.

I have also checked if any cables were loose, and just in case I unplugged and replugged them in.