I built a computer and it turns on, but the screen, mouse and keyboard are not responding

Rorotem

Reputable
Jul 27, 2015
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Hello,
I hope it is the right place to ask this.
I have built a computer for the first time. I bought a GIGABYTE GA-78LMT motherboard and AMD FX6300 CPU.
I installed to the case, and connected the PSU (500W). When I turn it on the fans and the LED work but nothing else seems to work. The mouse doesn't light and the numlock on the keyboard doesn't response.