HOA issue: When the neighborhood covenants are being broken, vandalism, general maintanance and well being of the neighborhood assets (pool, swing set etc...) then that is considered an HOA issue.
Neighbor to Neighbor issue: When a neighbor is doing something you don't like, ie...parking infront of your mail box, not edging his/her back yard etc.. and you want to HOA to get involved. Legally, the HOA cannot get involved with neighbor to neighbor issues. If you have issues with your neighbor, please talk to your neighbor directly or call the police to help you resolve your issue.