My mobo is outputting a red error light when I startyup PLEASE HELp

[greg_durg]

Hey y'all my computer isn't running. I just finished building it and the mobo is displaying the red light in the bottom right hand corner. It does a little sequence and then cuts out. My specs are:
i9-9900k( I know I know the mismatches in these specs are insane because of i9 9900k which btw I got for a discount thats why I got it and not a i7 9700k or something dont judge I just here for why this build isn't starting is my main priority)
dark rock pro 4
z390 Ud mobo
SAMSUNG 860 EVO Series 2.5" 500GB SATA III V-NAND 3-bit MLC Internal Solid State Drive (SSD) MZ-76E500B/AM
ZOTAC GAMING GeForce GTX 1660 Ti
Baracuda 2 tb HDD
Fractal meshify C case (white if that matters lol)
G.SKILL Ripjaws V Series 32GB (2 x 16GB) 288-Pin DDR4 SDRAM DDR4 3200 (PC4 25600) Desktop Memory Model F4-3200C16D-32GVK
EVGA SuperNOVA 650 GA, 80 Plus Gold 650W, Fully Modular, ECO Mode with Dbb Fan, 10 Year Warranty, Compact 150mm Size, ( if it helps this psu is emiting a yellow light idk if its meant to do that)

[thedangerine]

I'd check the motherboard manual to see what that light is for, typically that will tell you at the least vaguely what the issue is