My buick 2008 is making a laud humming sound and door locks stop working and fog lights want go off is this a electric problem and around how much will this cost to fix

It does sound like you are experiencing some kind of electrical related concern. It is difficult to know, however, where this concern is originating and what must be done to resolve it. Some troubleshooting will be required. Related circuits will need to be isolated by removing fuses until the problem stop. Once the affected circuit is identified, a wiring diagram is helpful in learning what wires are related and what components. Good luck! https://repairpal.com/repair-shops/buick-repair-and-service-in-evanston-illinois