How long does it take to install yosemite? Apple logo is up and the installation bar stopped half way. Been like this for 1hour now! HELP!!!

In that case, perhaps boot to safe mode and check your login items in system preferences - perhaps an app is stopping the boot. Untick anything there you consider unimportant

Just a thought. The Yosemite installer will change your disk to Core Storage and try to get you to use File Vault (You can uncheck the option during the install process). However, Core Storage only allows two partitions, so if you have more, you may need to sort that before trying to install Yosemite.

It may help to boot into the Recovery Partition and run Repair Disc from the Disk Utility

http://support.apple.com/kb/HT4718?viewlocale=en_US&locale=en_US

Same. Recovery boot is Yosemite environment not Mavericks.

I've checked the SSD in Disk Utility and it's fine. Verify permissions found a few issues, mostly printer related, but fixing doesn't help it on reboot.

The same has happened on 2 of my Mac Books. I tried to restore from backup on 1 and the restore is unable to detect my drive and the other appears to have restored but then this morning it was back on the section to pick a recovery or re-install from Web. Looks like I will be placing a call to Apple tonight or going to the Genius bar tomorrow morning

Same problem here on a 2010 MacBook Pro running Maverick..

If you slide the mouse to the very top of the screen a menu will appear and under Window->Log you can get a screen that shows what is going on. There are some cases where there are things like homebrew or other programs with a TON of files that take a long time to install. If you see activity in the log, just let it complete. It may take a very long time, however. Mine took hours.

Funny enough, I had it working at one point. Went into safe boot first, then shut it down (not a restart, but shutting it down), then rebooted in normal mode, and suddenly I got to the login page. I clicked on the login wheel, the beach ball started spinning, after three tries I got to the password box and I was in.

Then I left it, it went to sleep, but got out of it without a problem. Then I shut it down again, tried to start again, and now I seem to be back at square one: the bar stops half way.

I am not an expert, and have no idea how to proceed.

If anyone works this out please let us know. I'm having the same problem- I've left it for over 5 hours and it stays on the half-way point like the picture and won't go anywhere. I'm now on my 4th restart (when I get home from work 10 hours from now we'll see if it goes anywhere... but I doubt it).

Did I understand some of you right- that you tried to reboot from a time machine and that didn't work either?

I'm now trying an OS reinstall from the Recovery (Command-R) boot now, seeing lots of errors in the log (Command-L) and am again at the "About 2 minutes remaining" stage (which took a couple of hours last time).

Doing this is so I can hit "Send to Apple" and "Save" on the log, hoping to figure out what's wrong.

I expect that the reboot to OS X then will have the same problem of not booting the OS with the progress bar getting stuck half way on the grey screen with the Apple logo, I'll try booting Single User Mode (Command-S), then try Verbose Mode (Command-V), then try Safe Mode (Shift), and and see where we get (and post back here).

Also might try another machine to see what happens.

You did just hold the power button to reboot?

I am having the same issue as well, I have tried force quitting, reinstalling and nothing is working. I am on at least my 10 th attempt. I love Apple products but this is very annoying and as ever Apple remain silent..... must have heard now have log on screen....and terms and conditions

I Have finally got onto Yosemite after about the 20th try, thought iTunes and the App Store keep going into non responsiv, I love Apple products but when they have a beta and still get these issues it is very frustrating

I downloaded Yosemite on my iMac, and on my broadband (but very slow) connection, it took 5 hours. It showed that it was downloaded, but then nothing. Couldn't find any evidence of Yosemite. I rebooted, thinking that might help. It didn't. I've now gone back to the App Store and am starting another 5 hour download. Extremely frustrated, to say the least. Anyone else have this problem?

Verbose Boot:

[snip]

Darwin System Bootstrapper 2.0.0: Tue Sep 9 16:30:56 PDT 2014; root:libxpc_executables-559.1.22~6/launchd/RELEASE_X86_64

boot-args = -v

** /dev/rdisk0s2 (NO WRITE)

** Root file system

Executing fsck_hfs (version hfs-285).

Warning: couldn't block sleep during cache update

Warning: proceeding w/o DiskArb

/dev/disk0s2 on / (hfs, local, journaled)

Synced /var/db/

BootCache: cache size (1352400896 bytes) too large for physical memory (2147483648 bytes), capping at 1073741824 bytes

bash: /etc/rc.server: No such file or directory

bash: /etc/rc.installer_cleanup: No such file or directory

Waiting for DSMOS...

process cfprefsd[88] caught causing excessive wakeups. Observed wakeups rate (per sec): 3272; Maximum permitted wakeups rate (per sec): 150; Observation period: 300 seconds; Task lifetime number of wakeups: 45264