When you're designing and building a modern PC from scratch, from the schematic up, there are a lot of mistakes you can make, and any really subtle problem is _usually_ your fault.
Take power delivery. It's an incredibly complex problem on a PC-class machine, and its stability is critical to the correct operation of the computer.
So imagine my surprise when our voltage regulator vendor eventually admitted that their DCDC converter had a design flaw that was causing our rail instability at work. ๐คฏ