Question First pc build, help questions

Apr 18, 2020
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So I just got in the mail the parts for my first pc build. Of which contained the following;

Case: nzxt h510
Mobo: asus rog strix B450-F
Ram: Trident G-Skill 16gb 300mhz ddr4 RGB
Psu: corsair cx450m
HDD: 1tb WD BLUE 7200rpm
extra: UpHere RGB fans

This is the first shipment of parts that I received and the CPU n GPU are to be delivered by the end of this month. I decided to put together the parts that I had like installing the mobo into the case etc. After plugging in all the case wires and cpu + 24 pin connector. I wanted to see if the mobo LEDS would turn on and see if the rgb fans would run. I plugged in everything correctly and turned on the psu. To which nothing lit up nor did the fans turn. Not even the power button on the case works. I was just wondering if I did something wrong or that not having the cpu/gpu installed is causing this?