I haven't build a computer myself since before my son was born. This year he turned 11, I thought it would be a good age for him to build his own. He picked the CPU and I used this site to find the rest of the components with the objective of making upgrades down the line as needed. I skipped the graphics card as he doesn't play anything except for Fortnite right now. Ordered everything from Amazon here in Canada so everything was a bit more expensive.
When everything arrived, I handed him the motherboard manual and told him to read it over before we got started. I pretty much left the build in his hands, which in retrospect, may not have been the best idea. With very close observation, he put everything together and I pretty much trusted he knew how everything went together.
First time powering it up, it didn't post. He tried everything, including reinstalling the CPU/RAM but no luck. We both thought it was either a motherboard or CPU issue since the CPU LED was lit on the motherboard. After a day of troubleshooting, I broke down and took it to the computer shop hoping they would tell us which part was broken.
Turns out, my son didn't attach the 8pin power cable to the motherboard that powers the CPU. $40 later we brought the computer home and it posts on the first try. Now he's been MIA for two days in the basement with his new computer. I guess I won't see him until he leaves for university.