cheers for the advice, we have now the problem sorted
The problem seemed to be with the heatsink, what i think happened is that when we took it from the original motherboard we did not add any more thermal paste because it seemed to already have a layer on it. Maybe this old paste had gone hard and therefore acted as a barrier between the heatsink and cpu. After we scraped the old paste off and added new, bingo no problems! works like a dream.
either that or the heat sink wasnt seated properly.
anyway there you go, you gave the right advice, cheers
