Why does your car make a grinding noise when you try to start it?

It been my experience that a loud noise when stating a car, grinding may mean the starter is not in right or on it's way out as in replacement.

It's quite likely that one of the mounting bolts that attach the starter to the engine has broken and the remaining bolt(s) are bent, as a result. The bolts should all be replaced ASAP. This is not an expensive repair.