'I have the same machine and occasionally have the same problem. My hands must be warm and I'll squeeze my test finger while triggering the lancing device. This works about 90% of the time (for me) but it's tough to do without assistance.
Roger, I did warm my hand under warm water and squeezed my finger a lot...it could have been easier if I lifted the machine to my finger, but the instructions advise not to do that, while the nurse at my cardio's office last week uplifted the machine towards 'my blood' drops. The nurse said it did not matter to move the machine!! The results were the same on both machine.