I am wondering if anyone else has had the same problem, since I have now had it twice, with 2 different D7 bodies and lenses. After fully setting up my D7 (charged battery, memory card, etc), I attached the Mintola AF 28-100 lens, turned the camera on, and pressed the shutter. However, nothing happened and the error message "no lens attached" appeared. After calling the store and Minolta, they told me it was a defect and the camera was exchanged the next day. We tried the "bad" lens on a new body and determined that it was the body.
The second D7 worked ok... I think it might have a problem with the antishake?? but it did work for a good 2 months... aprox 500 shots. It was off for about a week, and then there it was again the next time I turned it on.... the "no lens attached" error. After going thru the custom menu and turning off the shutter lock, I am not getting the error message, but the auto focus doesn't work. With the shutter lock on, nothing works!!
Please respond if you have had a similiar problem, or no problems at all! I am a little wary since this is now the 2nd camera that has had this problem. I am getting it ready to go back to Minolta, and very worried about it's reliability on my upcoming vacation.