did you try starting the engine without inserting it also? Make sure the battery is good too since it's an '07. It may help to know the comfort access keyfob uses a non-rechargeable CR2032 battery while the others are rechargeable through the ignition slot.

There is no "black thing" on the door handle... I see a few grooves on the top that are body colored also and that's what I touch to lock... but I'm not sure if non-comfort-access vehicles have those too. To open you just grab any handle as normal with the keyfob within at least a couple feet of the vehicle. With the trunk lid, you push the underneath button within proximity. Try all handles and the engine - you never know if one thing in particular is faulty when it comes to electronics.

__________________
'08 X5 3.0si - Alpine White / Saddle Brown interior
Specs: Sport Pkg, Premium Pkg, Tech Pkg, Comfort Access, Aero Kit, Style 433 staggered 20s on Conti DWS
Mods: Carbon 35 tint, LED angel eyes, GP Thunder 7500k fogs, H&R 20mm/25mm spacers, clear reflectors, gunsmoke-tinted taillights
Coded: Digital speedo, windows/sunroof/tailgate close via keyfob

X5 pics at Flickr