About a year ago I built my computer and installed Windows 10 on it, it bluescreened once when i was installing it, but it didn't do it again for a while, because I was downloading stuff when it was still new. However, a few months later, I noticed it would crash and give me a blue screen whenever I would leave it idling and come back after a while. When I rebooted it, it would crash three or four times on bootup, then it would work fine for weeks. Even teamspeak running in the background kept it from crashing, but if I had nothing open, after a half hour or so, it would crash. I ended up trying to reinstall Windows, because it got worse and worse. However, when trying to install it, it would crash when trying to install. After this, I tried installing Ubuntu through a self made USB boot disc, and it would freeze after I hit continue on the install screen. I have tried RMAing the power supply, switching the RAM out and buying more, and I have tried an HDD and an SSD to see if it was the original HDD's fault. After all of this, it still does the same thing, so now I am thinking it is the motherboard or processor, but I need some more experienced opinions before I RMA or buy new parts.