Once those screws are removed, carefully remove the CPU.

This is apple's 300-Pin connector, it is found on this Mac, and MDD's (This cpu won't work in an MDD) and similar to the one in PowerMac G5's.

This connector is incredibly hard to remove, because of the way it connects, it is also very hard to remove without damaging it, if you don't pull it straight up, you will, most likely damage it.