Not sure what’s up with computer?

So I just built a pc specs are

GTX Asus ROG 1070 ti (used)

ryzen 5 2600 (new)

Asus rog b550-f MOB (new)

16GB Corsair ram 2x8gb (new)

corsair tx750w psu (used)

so finished building it had windows up and running, played some war zones on max testing it worked great, went ahead ran benchmark tool got good FPS and temps were below 70 which is good so went to bed, next morning power it on reset my ssd to clear junk and start files fresh and did few downloads hoped onto final fantasy 15 demo see how it’ll run with that cause why tf not and as I’m &&^&^$ with the settings screen goes black look at the GPU and instead of my beautiful rainbow rgbs it’s orange and the fans are at 100% use then it shut off, let it sit for a bit cause well figured I !#^&@@ it off with the orange lights and fan speed buttttt when I turned it back on yea everything boots on all fans power up and all that but the GPU is blinking red, on my board the yellow boot light on the Qled is on hard drives are running he’ll put them back in my laptop to make sure yea they work so tried resetting the cmos didn’t do $@$* took the little battery out put it back nothing !&&* tried the cmos and battery together that didn’t even work so let it sit for few hours try all that again still monitor say no connection from the pc tried plugging the display port in the MOB and GPU took the GPU out and tried just the MOB disassembled the entire pc put it back together tested all my ram slots 1 slot at a time yea nothing still soooooo anyone know what else to do except hit it with the screw driver till it works. Oohhhh also I cleaned the absolute &&^& out of all the parts like even took the GPU apart