I work for an IT consulting firm. Welcome to my world!
Fortunately, you figured out fairly quick that it's always a process of elimination and that the usual suspects are not always the ones to blame. A cable starting to give out is one of the hardest to nail down by the way!
Welcome to the Coffee House! Feel free to grab a cookie or two. The restroom is down the hall, but it's locked and we've never been able to find the key...