and now I am getting a "burning" smell from this power unit

worked great for about 6 months and then it started producing a burning smell that filled the whole room.

6 months later, on April 25th, I started smelling an electrical burning smell from inside my computer, and shut it down promptly

Ran fine for 5 1/2 months, then one morning it starts giving off a strong burning smell.

Was pretty good and quiet, but after only a little over a year of use it suddenly decided to get really loud and emit some kind of burning smell

We do use the TX750M for the systems we build at my work, which stay on near 24/7, and those don't fail all that