[The Fixer]

Hey guys,
The computer that my son plays with is ancient (it was my old computer, at least 8 years old) and dying a slow death, but he's only 7 so he obviously doesn't need anything special. I replaced the power supply and DVD drive a while back so those are OK, but I need a full-size ATX motherboard, processor, RAM (unless it's the same as what's in there now) and hard drive. Anyone got anything used and budget-friendly that still works good?? I'm in Bergen County, and can pick up parts if you're close by.