Bobbin Isn't Picking Up Top Thread

I'd certainly change the needle, you may not be able to tell whilst in position but even very slight bend on it will stop it picking up and probably hit either the plate or bobbin case. Another thing to check is that the bobbin thread is not tangled or too tightly wound.

The timing gear is out of "whack", take it to a repair shop, there is no quick fix I can think of. Good luck.

The needle may not be in correctly.
Check your presser foot that it is in correctly.
Hand roll the machine so you can see where it is hitting. It might be the dogs have moved.
Make sure the bobbin shuttle is locked in place.
Could be timing.

Ria