Next we need to remove the hard drive, DVD drive and wireless card

There are 4 standard-sized screws holding the hard drive in its mount

The screw that is holding the DVD drive in the case is slightly smaller than the standard screw

There are two screws holding in the wireless card. Remove them and it will easily come out. Also remove the white and black antenna cables from the card

When the hard drive mount is removed, pull the hard drive cable away from the hard drive connectors. May take some wiggling.