need help with ceiling mounts

[Flash]

nothing in the area such as a light... and we tired paper, cardboard and still got nothing... I went and picked up a $60 stud finder maybe this one will work... and yes I tried all directions. my basement is 16" centers and they joists run north to south...If I had the option to cut out a small peiece I would... but i'd never get that fixed and the other half is already wanting to murder me!