Question New build noob black screened. What have i done?

May 8, 2020
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I completed my build and was able to install windows 10 just fine. When i connected to the internet the connection was found but when i searched for updates i got black screened. Everything seemed like it was running but the monitor couldnt detect. When i power on it show the the motherboard logo and i can enter bios, if i dont enter bios immediately after the mobo logo it thunks to black screen. What have i done?