I recently bought the logitech cordless desktop S530 Laser for Mac but i cant seem to set it up right. I think it is actually a defect because: 1. the receiver refused to turn on and eventually it did but it wont connect with either the mouse and keyboard 2. i even tried new batteries, still the same result. mouse connects for a second and then drops. keyboard wont connect at all. i feel like niether the mouse nor the keyboard are staying turned on does this sound like a defect or am i missing something?