"The most likely reason they recommend staying with the supplied PC is liability. The system has been tested / certified with that PC, and no others."
- That is correct, when I was in the business, years ago I sold high end electronics and after market power cords where only being produced by a couple dozen providers. We had this exact conversation back then. The three electronic companies I represented all provided UL approved cords only. It had to say that on the cord for the companies protection.