One of the more memorable computer problems I solved were when I added some lego blocks to solve a recurring windows bluescreen
A friend had a Pentium 3 (slot 1) that kept throwing him several bluescrens per day so I decided to help
I open up the computer and saw that the processor were not properly securred in it's place and the plastic pieces that should have holding it in place were gone, so I improvised pressing in some lego pieces that I found somewhere to secure that the processor didn't move if someone were walking close to the computer and after that he didn't have any more bluescreens than the rest of us