MacBook won't boot after installing beta and restarting

[johnnnw]

Well this is annoying, MacBook installed beta, I went through the set up and then I needed to restart. Did so and now it won't boot at all.

It shows a progress bar and then about half way shows a circle with a line through it.

Help. Not sure what to do.

Picture

http://postimg.org/image/6s4v1i0cb/

 

[johnnnw]

Help?

 

[Apple_Robert]

Did you try holding down the option key during boot? If so, what did it display? If that didn't show anything different than your pic, did you try recovery mode? How old is your Mac? Looks like it isn't able to see your HD.

 

[DeltaMac]

The "prohibited" symbol usually indicates that something in the boot software is corrupted, or installed incorrectly, or that the hardware isn't configured properly to boot to that system.

Circle with Slash - could not load boot.efi, or some other issue

I would suggest that the system just is not installed correctly.
Does your MacBook have other partitions that might "confuse" the boot process, like a Boot Camp partition with Windows?
Reboot to your Recovery system (Command-R), choose Disk Utility, then Repair Disk - just as a check.
(Does your boot drive have plenty of free space for the install?)
Then Quit Disk Utility, and continue with a Reinstall OS X.

Make sure that nothing else is attached to your MacBook, such as external storage/printer, etc. while the install is progressing.

 

[johnnnw]

The "prohibited" symbol usually indicates that something in the boot software is corrupted, or installed incorrectly, or that the hardware isn't configured properly to boot to that system.

I would suggest that the system just is not installed correctly.
Does your MacBook have other partitions that might "confuse" the boot process, like a Boot Camp partition with Windows?
Reboot to your Recovery system (Command-R), choose Disk Utility, then Repair Disk - just as a check.
(Does your boot drive have plenty of free space for the install?)
Then Quit Disk Utility, and continue with a Reinstall OS X.

Make sure that nothing else is attached to your MacBook, such as external storage/printer, etc. while the install is progressing.

I indeed do have a bootcamp partition.

So I need to reinstall OSX ML (my 2012 MacBook shipped OS) and then upgrade?

This won't delete my bootcamp will it?

 

[DiabBarca]

Same issue
Please heeeeelp

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Sorry I didn't see the picture, my case is different. I didn't have that sign on my screen

 

[w0lf]

trim enabler?

 

[Montymitch]

Same issue here. Nothing attached, wouldn't let me boot in. I ended up erasing the disk and I'm restoring from a backup right now.
2010 MBP 15" with a samsung ssd.

 

[johnnnw]

trim enabler?

Yes. Now that I think of it I had JUST installed chameleon. Why did this cause it to happen?

I am currently restoring to a TM backup I made right before I installed the beta

2012 MBP with a Samsung SSD

 

[DeltaMac]

Looks like Chameleon has good steps for removing the effected driver files.
You may want to do that, and wait until Cham… is updated to support 10.10.
http://chameleon.alessandroboschini.it/faq.php

Here's how I would proceed. When your restore is complete, reinstall ML. I would probably run through relevant steps to make sure there's no trace of Chameleon - assuming you want to try Yosemite again. I hope you have a backup copy of the ML installer, as the Yosemite probably replaced the Recovery partition on your SSD. I have ML installer on a USB thumb drive. That might be really handy for you, too!
Keep in mind - there's a reason that Yosemite is called a beta - it's not finished. and some kinds of installations may have unintended consequences, including not booting at all. Having a good backup before you install a major system beta is really important (and now you have good experience with that)
I just hope that you don't have to wipe the drive completely (forcing you to restore your Windows partition from its backup.) As you did mention the Boot Camp partition, you need a backup or THAT using some nice Windows backup software, too. Winclone is one that folks mention as a good one.
Finally, report to Apple about your difficulties with Yosemite, as that's one of the "duties" that you have as a beta tester.