So I started my first build today, and when I tried to test if it is working, the computer wouldn't turn on. The PSU did not turn on, the case fans didn't light up or spin, and the only thing that did happen was that when I turn on the computer power button, something light up which has an electric icon at the bottom of it. I also tried the paper clip test, the power supply was fully working an the fan spins as well, however, the computer won't turn on nor the fan even spin, nor has the PSU turn on either. What seems to be the problem?