My MacBook Pro won't start up. Just get that gray, blueishy screen and don't go on.
Try a safe boot.
This boot takes longer than a normal boot, be patient. If it boots login, and see if it seems normal. If so, logout and reboot normal.
I have the same problem, the this trick works for me (boot in safe mode, then re-boot to normal mode). However, its really frustrating to have to do that almost every time I shut down. Any ideas why it is necessary?
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