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 Start reseating everything, power cords, ram, cpu, everything. From there just start swapping stuff back and forth, two sticks of ram? Try it with just one, then the other. If its still kaput after all of that you probably have a dead motherboard or faulty powersupply. 
 @Salastil 

One CPU is dead for sure, on the other machine there error debug light is on. Building two of the same machines