I have some problems with my hard drive in my Macbook Pro with Mac OS X Lion. Now I have tried to erase the hard drive to use Time Machine. But I can do nothing with the hard drive. Erasing fails and if I try to install Lion again it says that the hard drive is locked. I even tried to use OS X 10.6 startup disk and erase from there. But no luck there either. What's going on with Lion and locked hard drives?