|From my understanding the inverter is cheaper and more commonly goes out. You may want to ensure that the cable isn't just loose. |
Not knowing the exact model, I would look up screen replacement on google for the specific one(in there it will probably tell you how to get to the ribbon, as a note many of the pieces there are delicate, so pay careful attention to instructions/warnings)
Depending on the how experienced you are I would say the inverter replacement is anywhere from mildly challenging to a bit difficult, yet not impossible.