I've been searching and searching the EPA website and getting what seems like conflicting information. For instance, I read that circuit boards are not classified as hazardous waste if they are left intact. Yet it's universally accepted that they would be considered hazardous if dropped off in a landfill.

But anyway, I know that if a computer is sitting on my desk for my personal use, it is not considered hazardous waste. But that's about all I've been able to figure out.

From my place to the refiner, at what point does a whole unit (computer, monitor, etc.) and its parts/components become classified as hazardous? Anybody know? Links would be helpful, if possible.