If you have put everything properly while assembling the parts, this might be a failing ram or hard drive. try using one ram card at a time if you have two cards or get a card from someone to test your mobo. Get a different hard drive from someone and see if that works. Did you get any errors while installing the drivers of gpu and any failed windows updates?
My ram was fine last time I checked it, and I installed my hard drive correctly. I can check again and let you know though. And no errors that I can remember.