polarity back wards

Forum discussion tagged with polarity back wards.
  1. K

    polarity screw up please HELP

    I bought a replacement power supply for my dell upgraded to 90w-ac but the prob it that the old one was +on out side - on inside and the new one is back the other way around what did I fry. me thinking that they would send the right one I didn't think to check that HELP it is a dell n7010