Lenovo Legion 5 pro black screen problem. please help :(

hi all, I got the Lenovo Legion 5 pro for a year now (since may 2022 on my bday :D ). it haven&been damage or anything too, before the screen went completely black I was playing fallout doing some quest and than the screen decided to turn if self off while everything else was still running. it&really weird, since the day before that it was running fine as usual. I&just abit shock since I paid a good amount of money for it, than this happened. ive been saving it for years to get it and for this to happen within a year of owning it just saddened me :(. I tried everything from restarting to rebooting with a HDMI to another monitor/TV and nothing happen. at some point it did show up on the TV about having trouble shooting so I try to reset and reinstall windows. everything seems to be working, but as soon as the window download get to a percent it just go back to black screen and lost signal. if anyone knows how to fix this please feel free to comment below. Lenovo........why...