Question My computer won’t turn on

[ItzShorty]

I have just finished my first build and I plus it in and get everything set up... and I flip the switch and press the power button and. Nothing, there is a little flash of rgb and the gpu fans start for a good half second and it just goes dark and does nothing! Please help me! Everything is fine I’ve checked every wire and everything I don’t know what to do.

 

[norcalsc]

you need to list ALL components make and models please