Macbook not loading up after Yosemite update

[fightingirish46]

Has anyone else had a problem with your Mac booting up after installing the update to Yosemite?

My MacBook automatically updated last night while I had it closed. This morning, I open it up and see the update has less than one minute left. That stayed like that for bout 10min. I restarted the MacBook and it would shut down after bout 5min of it loading up. Then, I restarted the MacBook in Safe Mode and after 3hrs, it is at this stage (see attached pic).

Can anyone help me?

 

[Mahler12x]

Same here. Worked on DP1 but get the shutdown on boot logo every time. 2010 MBP here

 

[grahamperrin]

… Safe Mode and after 3hrs, it is at this stage …

Is it a hard disk drive, hybrid, or solid state?

Please use Feedback Assistant to report the problem to Apple.

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I suspect that for some users, the OS ceases to drive the disk properly whilst running fsck_hfs … visualise a disk not spinning up when required.

Parts of the following discussion will be useful:

Will not boot into Safe Mode

 

[0970373]

I had this problem yesterday after I tried to enable trim on my MBA (replaced it w/ new SSD 6 months ago). If this is what you did, read this. I had to reinstall Yosemite on my test mac.

 

[Sakejaul]

Hi I wonder if anyone can help I installed the Yosemite public beta today and all was working pretty fine until I turned my mac off earlier and turned it back on now I'm stick with the apple logo loading screen, email me on jakesaul@live.com if you can help #I'm pretty stressed