Hinges have come loose from particle-board cupboard
I'd go with an epoxy filler rather than a cellulose based product. You've already got chipboard, and you need all the additional strength you can get. Drill the old holes out to a size larger than the screws, including thread. Fill the holes with a 2 part epoxy and let dry. Level the surface as needed, then drill pilot holes for the screws into the epoxy. Screw the hinges back on.