I've just run an update on my MBP and it's stuck on the grey screen with the apple logo and the progress bar showing complete. It's been stuck like this for well over an hour. I've tried turning it off and back on again and it just goes straight back to this screen. Is there anyway to fix this without doing a full reboot/reinstall from time machine as last time I did this it took about 10hours as I have over 900gb data on the hard drive, plus my time machine disk is at work and I won't be able to restore until the morning Any help appreciated. P.S. I can't launch in safe mode or in diagnostic mode.