[huggyface]

I hardly want to defend Dell support (knock on wood but I've never, ever had to directly deal with them), however what you experienced is hardly unique -- they see a usage outside of the norm and assume the usage is to blame. Honestly if I were you I would have said "Oh yeah, plugged it into my `normal' PC and it still looks terrible" and they would have replaced it. Unfortunate that it demands a lie or two, but such is the nature of tech support.

And I would hardly give Apple a free pass. They are the ones who are quite eager to blame any issue on a water sensor that is well known to indicate false positives.