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Those LGA775 mounting pins have to be pushed down pretty hard to get that final click where they're 100% in. I thought my heatsink was on all the way more than once but on closer inspection there was still 2 pins only partly in. Check the pins from the side very closely and be sure the plastic tabs are under the lip. On the back of the motherboard you should see all 4 pins splayed out with a little spike protruding between the 2 halves of each pin. Not trying to patronize, just sharing my own mistake on the off chance that you made the same one.chinky714 said:
