The question is, is it worth the price of your PC if the PT blows the USP port?
That's the reason many of us buy the wall adapter (AC/USB) - my PT costs $15, and the adapater around 5-10 - my PC is worth 10 times that - no brainer there in my book lol
As for a non working PT - I run over the cable all the time with my chair - stupid short cable - even worse with extension cord though lol - and I think I broke mine too - battery on my 3.v was fine (switched it out and it still didnt work but they are cheap so Ill get a new one). Luckily I have a 5v to carry me over
