Why isn't my new custom PC working?

Pixelcubed

Commendable
Sep 9, 2016
11
0
1,510
I have built my own custom PC, using the following parts:
CPU: i5 6500
Motherboard: MSI Gaming H170 Gaming M3
RAM: Crucial 8GB 288-Pin DDR4 SDRAM DDR4 2133
Power Supply: Corsair CX500M
Case: Carbide Series 300R Windowed
GPU: MSI GTX 1060 6GB
Hard Drive: WDC WD10EZEX-60M2NA0

I have replaced my old motherboard, RAM CPU and GPU, but kept everything else from my previous build. I am not very experienced with building PCs, so I used some youtube tutorials and a bit of guesswork to put everything in.

When I turn on the computer, the fans start and the motherboard lights up, but the GPU fans do not start. Also, the monitor I have connected the PC to says "No Signal". What are the most likely things that I have done wrong/need to do?