As Jeff says, do a daytime test setup, you may need an extender or some adjustment to come to focus. If you had a diag in previously I'd guess you need to need to extend the focusser further out.
Simple test just do it through the eyepiece visually. I quite often just hand hold it facing the focuser tube to get an idea of where it might be. Then rummage through my box of bits to find something about the right length.
If it's well out of focus then stars just won't even show on a short exposure, they are just giant blobs.