Electric parts don't get "burned in" ... they get "burnt out" (you wanna flame me go ahead)
Could be your motherboard, could be your cpu, could be your ram, could be your thermal paste, could be your heatsink, could be your powersupply.... unless i'm there or you provide me with play-by-play information i don't think i (or anyone else) is likely to give you a coherent response. Sry
