Is the 8 pin power cable connected to the motherboard? Does the CPU fan spin when starting the board?
Yep, 8-pin cable connected, I'll reseat it now once again.
And yes, the CPU fan does spin (Cool master EVO 212 Fan).
-This custom-built pc by pc-specialist is no more that 2 months old.
-This issue occurred only 3 days ago, it happened suddenly, was working on it, the screen went blank, QCode 00, though PC seems running correctly.