Macbook Pro mid 2010: Recovery Assistant can see drive but not write to it

Mi Problema

Macbook pro would not start up.

Mi Solución

Macbook pro would not start up. Replaced hard drive: didnt help. Downloaded recovery assistant onto a USB and selected recovery assistant at startup by holding option key. Recovery assistant could see the new hard drive but not write to it or format it. Got a universal USB adapter from Ifixit and tested old hard drive: working fine. Suspected that this meant problem was faulty hard drive cable (lots of posts on this problem). Ordered cable from Ifixit, 30 minute instalation and macbook all good !

Mi Consejo

If Recovery Assistant can see the hard drive but not write to it you may have same problem that I had.