Q: MacBook Pro doesn't start up to Apple Diagnostic

I have the issue that after an Adobe Flash update the Facetime/iSight camera is no longer recognized by the system. System profiler claims that there is no camery installed. the day before I had a nice Facetime call. See Here: Adobe Flash update killed iSight camera

And to find a solution for my problem I read some Apple troubleshooting docs and Diagnostic could be helpful to find out if the cam is really broken or if its a bug.

But OSX 10.10.2 prevents me from starting up to Diagnostic mode. When I hold down D the gray screen last for 60 seconds and boots as if I haven't pressed anything. But the MBP delays the start for the time I press D. I press when I hear the sound and before the gray screen appears. Is there an issue with the startup keys?Startup key combinations for Mac - Apple Support

And because there are not enough problems the battery seems to reach the end of life. I wondered if this is no accident that the battery and the cam broke at the same day. Will the cam work when I replace the battery? Its frustrating that the battery only has 270 cycles. Apple claims 1000 cycles to be appropriate.

I have no luck with my little 13'' MBP. In December 2013 the housing top case and the logic board needed to be replaced because the USB ports didn't work. And now as the APP ended in December 2014 all this s*** happens now.