Given very general homework questions like this, it is difficult to know what level your tutor would consider appropriate for this course.
That is like asking "What are the causes of my car not starting?"
And 'How do I put it right?' all without disclosing the context (was it running out of petrol the last time you used it, is it a long time since you last used it, is it cold, is it wet, has it done it before?)
PS: If you do find Pixellany's screwdriver while you are doing further research, it would be considered sociable to send it on to him.