The trick on these Dells is to pop off the plastic housing that the CPU heatsink fits into.
First, remove the screws holding the motherboard and the expansion board down. The expansion board is held into the case by a metal tab that bends outward. Then slide the whole assembly out of the case. On the expansion board, grab the side with a pair of pliers and yank on it until it loosens, then slide the board out. Next, set the motherboard on a flat surface and pop off the plastic housing that the CPU heatsink fits into. Once this is removed, the board should come off the metal backing. Maybe I can make a video tomorrow.
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