Question PC powers on , but doesnt power mouse, keyboard, or monitor.

Feb 18, 2019
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I have had my PC for about 2-3 months so far, and I built it with all new components. I don't play a lot of intense games, and the other day I went to power it on, and the display never came up on the monitor and the keyboard & mouse didn't power on. I have tested the monitor, mouse, and keyboard on my laptop and they all work. I have taken out the graphics card, RAM, and all the motherboard cables, and put them back in. Yet, I still can't fix this problem. The PC does start though because all the fans power on and the RGB powers on.

Here are my specs:
Intel - Core i5-8400 2.8 GHz 6-Core Processor
be quiet! - Pure Rock Slim 35.14 CFM CPU Cooler
Gigabyte - H370 HD3 ATX LGA1151 Motherboard
Corsair - Vengeance LPX 16 GB (2 x 8 GB) DDR4-2400 Memory
ADATA - Ultimate SU800 256 GB 2.5" Solid State Drive
Western Digital - Caviar Blue 1 TB 3.5" 7200RPM Internal Hard Drive
EVGA - GeForce GTX 1070 8 GB FTW Gaming ACX 3.0 Video Card
EVGA - 500 W 80+ Certified ATX Power Supply

Any help would be awesome. Let me know if I need to provide more details.