PC won't start, light blinks and it shuts down

FinePlayer

Reputable
Dec 18, 2015
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Hello!
So my friends pc won't start. He started it one day and it blinked for half a sec and then shut down. It did not show any sign of life after that. He took the pc to me so i could do my best to find the problem. I tried starting it with only the needed parts (cpu, ram, moba and psu) but it didn't start. I noticed that every time I turn off the psu, wait for 10 sec, turn it on and try to turn on the pc again it blinks again. But after the first time it does not.
So is the motherboard just broken? I does send the power from the psu tho so could it be something making the motherboard to not complete it's tasks?

SPECS:
CPU: i5-4690K (With watercooling): Intel Thermal solution RTS2011LC)
PSU: SilverPower 600W
Motherboard: MSI Z97 Gaming 3
RAM: 4x2 (8GB)

[yes I know there are a few posts about this but none with a good answer.]