Need help fast

Aerocool QS-240
Corsair CX450M V2
Asus Prime A320M
Ryzen 3 1200
Corsair Value 8GB DDR4
Western Digital Caviar Blue 1TB 3.5″ SATA ΙΙΙ
Palit GeForce GTX1050 Ti 4GB Dual OC
I see the orange led light but everytime i press the Start Button nothing happens
can anyone help me?
if possible can you send me video how to put the parts and cables and do cable management
i would be thankful

I had a similar problem when i was building my gaming computer, it was lighting up everything seemed to be working but then nothing was happening.
My fix was i looked at the motherboard manual and found out that i put the cables in the wrong place. Maybe you should see if you put your cables in the wrong spot.

then a cable might not be plugged in all the way

try to unplug everything and replug it and see if it works now, also check if everything is in the correct spot