Thanks again goes out to Geeks Are Sexy for finding this.
I’ve got to say, yes, this is probably about right. I’ve been in IT for quite a few years and a re-boot (or application restart) does fix a majority of the problems. It’s become standard for me to ask “did you restart the computer” or “did you hit refresh” before going any further. Other than that, it’s a good bet that probably another 2-5% of the problems are PEBKAC related (Problem Exists Between Keyboard And Chair). And this isn’t just for computers either. TV’s, VCR’s, DVD’s, game consoles, phones, cars, microwave ovens, refrigerators…you get the idea.