My ETH mining PC wont start. Help me identify the issue

[Milos97]

I have bought a PC to mine ethereum. It's been working flawlessly for the past 2 months, but this morning when I got up my PC was offline. I tried turning it on but no luck. Nothing at all happens when I press the power button... Even the LEDs on my MOBO (which were lit even when the PC was offline) are off. Turning the PSU off and on again, I can only see the LEDs light up for a fracture of second (blinking) once then going off again. I have unplugged everything (except the CPU but I've unplugged the cable that gives power to it) and tried to run it only with the MOBO cable plugged in, still no luck. I have to try my PSU on my friends PC just in case. Tried reseating the CMOS, still no luck.
Is the MOBO dead? Any other idea? What should I do? Thanks!!

 

[kanewolf]

First guess would be power supply. Obviously a mining PC puts much greater demands on a power supply.

 

[Milos97]

First guess would be power supply. Obviously a mining PC puts much greater demands on a power supply.

Thats true. But I have 6x GTX 1050ti's in here and Corsair RM750i power supply shouldn't have problems running them at all , as I'm sure my system doesn't even draw 400w. I have found some shitty LC Power 420w PSU and tried running my PC with the MOBO, CPU and ram with it. Still the same thing happens...
I have also tried connecting the PSU power cable to a different outlet, no lucc