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I know the feeling. I did my first build last Nov.
It took about 12 hours spread over three weekends.
When I finally turned it on, and all the fans were humming, I yelled "It's Alive!"
I was 59 at the time, and my friends of the same age or older are astonished I did this. Some can't fathom why I didn't just buy a Dell.
I get asked to help diagnose computer problems all the time. My response is always the same: "Well, it might be this or that. You need to take it in for service".
It would be different if someone who had built a computer or who was planning to build one was to ask me for help. Then I certainly would give it.
-Bob