Does slot 2 work though? If it's both slots and if both controller ports aren't working, then it's probably the ribbon cable. If one slot is only working [and likewise, if one or both controller ports are working], then it might be the contact pins not seating properly.
In the old 360Fly HD camera, the screw requires a #00 Philips head screwdriver. Unfortunately for me, one of the screws on mine was torqued down a bit too tight, that I ended up stripping the screw head trying to loosen it by hand.