I have just installed a new computer with :
Motherboard MSI 970 gaming
CPU : FX 6300
Graphics:AMD radeon HD7750
with a simple SSD in sata but I didn't plug it so ...
The problem is that I've plugged everything 8-pin and 24-pin, cpu fan + system fan +CPU, ventirad + front panel pins.
When I press the power button, everything runs for half a sec and then stop. I have already unplugged everyhting, clear the CMOS (The motherboard is a second-hand).
But I am experiencing the same issue.