My macbook pro will turn on but not let me go into my login page?
Troubleshooting: My computer won't turn on
Read and follow all the steps.
Mac OS X: Gray screen appears during startup
A flashing question mark appears when you start your Mac
Try safe boot also, just to see if something is causing it to hang before the login screen. (Hold Shift while booting up until load bar appears under apple logo)
Retrieving data ...