I know its both of them because...
After removing my mod chip, i inserted a disc and i just kept on getting a black screen. Saying there was an error reading the disc, and it said i had to eject it. So i figured i must have mest it up some how... Then my disc wouldn't eject, so i had to take it out by unscrewing the dvd drive. While removing the disc, i kinda touched the lens
So i put my wii back together, turned it on, inserted a disc, then instead of getting the black screen message. It just said unable to read disc....