You changed two things and the computer works, but you can't say with certainty which one was causing the problem. There are a lot of people out there who don't have extra displays with inverters to fix their problem. I'm sure it doesn't matter to you since your computer it running, but I don't understand why you don't think it could be the inverter since they go bad much more often than panels do. If they fail the computer will still start with no light, but if it shorts it won't.