I’ll second this - seemed a bit daunting at first but with a stripped screw and no screw extractor my options were limited. Having weighed up the options and carefully studying the pictures I decided that Laurence’s idea was feasible (if not a little leftfield!). I carefully marked out an educated estimate of where the screw would be under the black wireless/Bluetooth plastic board (you can see it from the side so used this plus the images supplied here) and drilled, firstly with a 1.5mm to mark the spot and then with a larger 4mm. Obviously this needs to be done very carefully so you do not continue and drill into the torque 6 screw you are trying to get to, but once the hole was drilled my bit reached down to the screw and could *carefully* be lifted up and through the newly created hole. Once the screw has been removed, along with the other 2 torque 6 screws in this step, the optical drive / caddy will slide out as opposed to being lifted vertically out in the instructions, but this proved little hassle
Abbie: If it's a greyed out wifi symbol issue, my understanding is that it's probably the wifi card / board itself, not the antenna cable.