Sure! I’ve even put computers back together after taking them apart. That bit is much harder.
My main work machine (which I am using right now) is one I built myself when I was 22. It was really fun, but kinda scary. It took a day and I wasn’t sure if any of it would work until I finally got to plug it in and turn it on.
Oh yes 🙂 many computers many times. I think the first one was actually one of the computers in the PC classrooms at school. Thankfully I put it back together and it worked :). (My teacher was not happy with me at all).
But you know, always there are some screws that remain at the end … but as long is it works, I think they are unnecessary.
I have broken couple of them trying to fix them.
Also I have opened a digital camera, a TV, speakers, and other electronics.