Installed osx (yosemite) on blank hard drive in 2010 macbook pro according to
BUT instead of getting the spinning planet at first step, I got a padlock (apparently to keep non-apple employees from futzing around). However, the following got me past that point:
and to be a little more descriptive than the link, with one memory stick out I held down r+p+option+command, hit power button until it restarted, and *continued* holding r+p+opt+command as it rebooted (screen on, off, fan&cd noises were the only indication) like 4 or 5 times.
THAT got me past the padlock but then there was another problem getting the new OS (non-descriptive error message "there was a problem..."). The solution there was to open terminal and change the date according to
Finally it was smooth sailing after that.