IMac Yosemite Help, install @ 50%

I was reluctant to install Yosemite on my 2008 iMac until now... The install is stuck at 50% on the grey screen with the apple logo. My iMac had been working great in the latest Mavericks, but wanted to upgrade it because my laptop has Yosemite and works fine with it. I have my work backed up on an external Drobo hardrive thank goodness.
This is the second installation, the first one went through, but apps would freeze. I talked with Apple Care last night , we verified disc and restarted the computer holding com.+R. They started me with a fresh download, that was at 10:00pm last night and it is now 5:30pm the next day!
If anyone can help please let me know, I have read many resources online and a lot of it sounds a bit scary! So I thought I would ask here....

I am so happy... I kept searching for answers here and found that this worked well... I have my iMac back with Yosemite!
Turned power off. Wait 10 sec. turn power back on holding Com +R. Turn Wifi off. Select restart from menu.
The computer rebooted and finished installation :-))

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SAFARI crashed after installing Yosemite-HELP!!

I have macbook air 11 inch bought 2 months ago. Everything was working well until I decided to upgrade to Yosemite- The download took forever so I went to sleep and opened the laptop today. Safari was not opening some websites (msn.com or yahoo.com) so I called apple support. After doing screen share-they said websites are opening and Yosemite 10.10.1 installation was not completed last night and it would be better if I did the upgrade. So Yosemite was installed.
After one hr-safari is worse than before. Websites either open with no picture and letters jumbled to one corner or website doesn't open at all
"safari cannot open the page"
So I can't even go to apple support website and get help so they can see the screen and help me. After spending 80 minutes on the phone with apple customer service waiting for someone to help me-I was told its difficult to help unless screen share is done but that is not possible as I can't go to apple website!!!
Please help!
I am so upset with this -I just want my mac back. I can't even find the button to delete yosemite!!
Note: I don't have wifi. My internet is through ethernet connected to the wall and mac directly.
Contacted my internet provider and I was told connection is ok!
Thanks

Please read this whole message before doing anything.
This procedure is a test, not a solution. Don’t be disappointed when you find that nothing has changed after you complete it.
Step 1
The purpose of this step is to determine whether the problem is localized to your user account.
Enable guest logins* and log in as Guest. Don't use the Safari-only “Guest User” login created by “Find My Mac.”
While logged in as Guest, you won’t have access to any of your documents or settings. Applications will behave as if you were running them for the first time. Don’t be alarmed by this behavior; it’s normal. If you need any passwords or other personal data in order to complete the test, memorize, print, or write them down before you begin.
Test while logged in as Guest. Same problem?
After testing, log out of the guest account and, in your own account, disable it if you wish. Any files you created in the guest account will be deleted automatically when you log out of it.
*Note: If you’ve activated “Find My Mac” or FileVault, then you can’t enable the Guest account. The “Guest User” login created by “Find My Mac” is not the same. Create a new account in which to test, and delete it, including its home folder, after testing.
Step 2
The purpose of this step is to determine whether the problem is caused by third-party system modifications that load automatically at startup or login, by a peripheral device, by a font conflict, or by corruption of the file system or of certain system caches.
Please take this step regardless of the results of Step 1.
Disconnect all wired peripherals except those needed for the test, and remove all aftermarket expansion cards, if applicable. Start up in safe mode and log in to the account with the problem. You must hold down the shift key twice: once when you turn on the computer, and again when you log in.
Note: If FileVault is enabled in OS X 10.9 or earlier, or if a firmware password is set, or if the startup volume is a software RAID, you can’t do this. Ask for further instructions.
Safe mode is much slower to start up and run than normal, with limited graphics performance, and some things won’t work at all, including sound output and Wi-Fi on certain models. The next normal startup may also be somewhat slow.
The login screen appears even if you usually log in automatically. You must know your login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin.
Test while in safe mode. Same problem?
After testing, restart as usual (not in safe mode) and verify that you still have the problem. Post the results of Steps 1 and 2.

My iMac hangs when installing Yosemite.

My iMac hangs when "installing on HD about 22 mins remaining" I did not check to see if this iMac can support Yosemite. What do I do now?

You can try using the full offline Reader installer from
http://get.adobe.com/reader/enterprise/

Can I un-install Yosemite from my iMac and re-install Mountain Lion?

Can I un-install Yosemite from my iMac and re-install Mountain Lion?

Sorry to barge in like this but is it because you found it to have it's own way of doing stuff without your control? As i was thinking of doing the same thing because i found Mountain Lion much more user friendly.I know you came for an answer just was searching and came accross your question.
Hope you find the answer. good luck.

The sound on my Mac Pro doesn't seem to be working since installing OS X Yosemite - help!

The sound on my Mac Pro doesn't seem to be working since installing OS X Yosemite - help!

I had a smilier issue... If you're using external speakers (as opposed to the ones on the display), you may need to re-select them in System Preferences. Some preference choices seem to reset with the Yosemite install.

Help installing photoshop on new iMAC?

Dear Adobe,
I need help installing photoshop extended on my new iMAC that doesn't have a CD drive.

Hi,
If you have a Photoshop Extended Disc then try these steps.
1. Create a Folder named Creative Suite 6 on the Desktop
2. Copy the content from the Creative Suite 6.
3. Paste the content in the Creative Suite Folder.
Try Installing the software this way or else try downloaoding the Softwares from the above mentioned link.
Regards,

CS4 transferred to an iMac with Yosemite OS, installed Java update, still won't open.

CS4 transferred to an iMac with Yosemite OS, installed Java update, still won't open. Should I reinstall from disks or can I get a free upgrade to CS6?

there's no free upgrade.
you 'transferred' or you properly installed cs4 using the installation files?

Dreamweaver CS6 hangs when trying to close it. (iMac, Yosemite). I have removed the configuration folder but it doesn't help. What to do next?

Dreamweaver CS6 hangs when trying to close it. (iMac, Yosemite). I have removed the configuration folder but it doesn't help. What to do next?

OS X Yosemite: If an app freezes or quits unexpectedly
Nancy O.

Yosemite stopped installing on my 2009 iMac. What do I do to unfreeze my computer back?

Yosemite stopped installing on my 2009 iMac, what do I do to unfreeze my computer?

I have yosmite on 2 computers iMac and Laptop, Let it be and it will start up again
if not bring to apple store in am

Help Installing OSX Tiger on iMac G4, seems HD Volume Structure corrupted

I need help Installing OSX Tiger on an iMac G4 800MHz 17" Flat Screen LCD, 80 GB Hard Drive, 256MB RAM, DVD-R/CD-RW Super Drive, model# M8812LL/A. I have a Tiger install DVD and i put it in the drive and everything is fine....I go through the steps and when it gets to "Preparing the Disk" - "Verifying destination volume"....it just sits and nothing happens. It will go on for 20+ minutes or so and then the installer will quit saying there was errors during the update. Anyone got any idea what is happening? I'm running OSX 10.3 Panther currently. I just tried running Disk Utility using the install DVD.....it attempted three times and couldn't repair --- I then went out and purhased DiskWarrior --- I boot from that disk, it begins to run; then as it is repairing the volume it freezes and stays frozen for hours. I've rebooted and tried it numerous times with no luck. Is the HD no good? Should I just do a complete reinstall of Tiger and erase everything? I'd rather not, but I backed everthing up in case I need to. Also, when I ran TechTool Deluxe from the booted CD, it said the Volume Structure was corrupted. My Tiger disc is a retail full install disc that I purchased.
Thanks for your help!!!

Use Disk Utility to Restore to a FW drive.
Use one of your FW drives, and create a 24GB partition - later you can reuse this for your emergency boot drive). Restore the DVD to FW volume. Boot from there to install with - very fast.
Low level format is what you probably want/need and the only way to do that is ERASE with the option to ZERO-ALL (after you backup any files you don't now have on disk or DVD.... and where are the backups?).
When you install it will also verify the DVD install disk itself.
Have you tried using FSCK from the command line? Or do you no longer have a valid system on the boot drive? Nothing to lose it seems at this point from trying. Just hold down COMMAND + S on startup. At the prompt, follow direction to type:
/sbin/fsck -fy

I have just installed yosemite and installed iPhoto but when i go to upgrade the iPhoto library and just shuts iPhoto???

i have an iMac on OS X Yosemite 10.10. i have two equal user accounts and have just upgrade and installed the latest version of iPhoto to use on yosemite, every thing was fine and when i opened iPhoto it said i needed to upgrade the library which it did, great....however when i went into the other account to do the same, it installed the latest version fine and i then got the message to upgrade the library so i clicked yes and it shuts down....why??????

Uninstall... run the Cleaner... Restart your computer... Reinstall
-http://helpx.adobe.com/creative-cloud/help/install-apps.html (and uninstall)
-using the cleaner after uninstalling and before reinstalling will usually help
-http://helpx.adobe.com/creative-suite/kb/cs5-cleaner-tool-installation-problems.html

How do I perform system maintenance on my iMac (Yosemite)?

I would like to know how to keep my Mac clean and healthy. And I'm also trying to help out my sister who is having trouble with her iMac (Yosemite) that is sick. Any ideas or suggestions would be greatly appreciated!

The best way to keep a Mac clean and healthy is to not install applications that claim to clean it or make it healthy. It has built in maintenance routines that run automatically and installing 3rd party cleaning etc. utilities is one of the biggest source of problems. The following has some information that may be of interest: http://www.reedcorner.net/the-myth-of-the-dirty-mac/
Regarding the trouble with your sister's Mac, it would be a good idea to start a thread with something specific in the title about what problem(s) it is having. The following also may help: http://www.thesafemac.com/mpg/

I am a fitst time user of the new airport extreme time capsule 2TB. I have a mac book pro and an imac. I installed the router today and got my computers online wirelessly. BUT I cannot get my previous wireless printers to connect with the router.

I am a first time user of the new airport extreme time capsule 2TB. I use a macbook pro and imac. I installed the router today and got on wirelessly. BUT I cannot get my 2 printers that were previously wireless to find the router signal. The worked fine on my current set up OS Mounitain Lion 10.8.4. Apple tells me it is the printer mfr issue and printer companies tell me it is apple issue. Any help appreciated.

birdmanjay wrote:
... Apple tells me it is the printer mfr issue and printer companies tell me it is apple issue.
Arguably, they're both right.
Changing your router changes everything, so your best course of action is to research the respective printer's documentation and determine how to reset them to factory default condition. Then, add them again using System Preferences > Print & Scan.
For that, I recommend you first "reset the printing system" according to these instructions: Mac OS X: How to reset the printing system. Its instructions for Lion are identical to those for Mountain Lion.
As the article states, it will remove all your existing printers, leaving the Mac's printing system in a similar "factory default" condition ready for you to create a new print queue for each printer, which you should probably do.
Apple's printing support documents contain a great deal of redundancy, but this one may be a good place to start: OS X Mountain Lion: Set up a printer to print wirelessly

How can I return to use OSX (Yosemite) after installing Windows 8.1?

How can I return to use OSX (Yosemite) after installing Windows 8.1?
I cannot find Boot Camp on my iMac (late 2013) with windows installed. So I downloaded it, but I cannot run it because of an error (x64...). I tried to use my USB stick with bootcamp installed but nothing. When I turn my iMac on it starts automatically with windows. I tried to search it, but I found only the setup and it doesn't work. How can I get back to my APPLE iMac? How can I use OSX?
Excuse me for the (maybe) uncorrect language, I speak Italian.

Hello!
You can start your Mac up with the [alt] (sometimes [option]) key pressed and you will get the Startup Manager.

I have downloaded Acrobat XI Pro as a 30 day free trial onto my iMac (Yosemite OS). When I open the program using the Adobe icon, a screen appears showing a number of "ReadMe" files. How do I proceed from here?

How do I proceed from a screen showing a number of "ReadMe" files in order to open the Acrobat XI Pro program? I downloaded a 30 day free trial of the program onto my iMac (Yosemite OS).

What is the other file in that folder, not the Readme? Did you actually install the software yet? And did you read the Readme for instructions?

IMac Yosemite Help, install @ 50%

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