New motherboard, cpu and ram - can't boot pc, only led light works

Jan 14, 2019
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So I bought and installed a new motherboard, cpu and ram but when I tried to start my pc, only the led light on my computer turned on. I tried checking if I pluged the front panel plugs into the right place but still no luck. The only thing i can see is a not connected 15 pin SATA plug coming from the GPU. Here are some photos:
My PC: https://m.imgur.com/gallery/dUfxGTI
The SATA plug coming from the GPU:
https://m.imgur.com/gallery/37qBGZC

My components:
Motherboard: ASRock FM2A68M-DG3
CPU: AMD Athlon X4 840
GPU: Nvidia Geforce GTX 650
PSU (Power supply): EuroCASE ATX-400W
RAM: 2x 4GB DDR3
 

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