Cheap PSU's will usually die if they are overloaded. If you're lucky, it'll just snap a small resistor or something, and that'll be the end of it. If you're not lucky, it'll send a power surge through the system, as the capacitors find an alternate discharge route, or it might catch fire.
Good PSU's are usually designed to safely shut down if overloaded.
In the event that they do die, you do have a manufacturer that will give you warranty service; I'd say "Good luck" in trying to get service for a Viking, or other generic PSU, assuming they'd even have a website.