computer won't start

I am building a new pc and when I plug all my parts in for testing nothing turns on. Literally nothing happens. No fans spin, no lights, just nothing. I tested my power supply with a paper clip and its works fine because the fan spins. I also have sent back my motherboard for this fresh new one...

I have a Dell PC that's a little over a year old. Here's its description on Newegg. Here is the problem: 1. Yesterday ,the computer shut down when I walked away for a few minutes. 2. When I tried to turn it back on, the power light turned orange, then quickly tuned white, then made a faint...

Hello guys , thanks for helping already. Ive just put together my pc , my gpu is factory overclocked i already tried increasing the voltage and it fixed some of my problems , but i cant play pc games in a stable rate in my decent pc. Not even cs go.it freezes sometomes and graphic intensive...