Continuous hardware problems
So about four months ago a friend of my helped me build a computer. We installed everything and it worked fine for a few hours until the PSU died. So I sent it back and got a new one, and everything was working fine for about a week. Then one day my computer was unable to start due to some smart health status thing that said my hard drive was bad. So I sent that back to and got a new one. Everything worked for about 2 weeks but then my computer kept getting blue screens every time I tried to start it up. So I tested my RAM and it failed Memtest, so I sent it back. I just got the new RAM today and installed it into my mother board. But when I started my computer up I continued to get the same blue screens. I talked to my friend and he said that the next most likely cause of the problem might be my mother board, but suggested I make a post on here.
If anyone has any advice for me it would be much appreciated.
Also the only things that I have not replaced are my CPU and my motherboard, so should I just get them both replaced to be safe?