Retina iMac Yosemite reinstall problems

I'm trying to reinstall Yosemite on a Retina iMac, but I cannot get the machine to reboot into recovery mode. I am using Command-R and holding it down throughout the boot sequence and all that comes up is a black screen with a white Apple logo. At that point it just hangs. Any one have any thoughts about what is going on? Thanks for any insight.

What happens if you use the option key on boot up (push that key right at the bong sound)? Also if that does not work try command-option-R for internet recovery.

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IMac Yosemite connection problem

Yesterday updated my 2014 iMac to Yosemite 10.10.2 .
Up to that moment everything worked ok but after updating the iMac doesn't connect to Wifi, doesn't connect to the internet even when connected by ethernet.
How the **** can you restore an iMac that doesn't connect to anything?

In System Preferences --> Network --> Location bar (top of the screen). Pull down the the menu bar and click on "edit locations". Click the plus button to add a new Network Location then click Apply. See if that will force your iMac to connect to a network.

Imac yosemite x problems

CAnnot start or restart. Get error saying computer encountered an error and will resart which it does. Same error measage and a flash of highlighted dialogue on left screen. Restarts itself and half way through loading bar same thing happens. Continuous cycle. Have tried starting in safe mode. Have reinstalled os and everything. Continues to happen.

Yosemite is a free upgrade. If you have currently a solid Mavericks system and do not need any of the features of Yosemite, then you do not need to upgrade. Just be aware that should you ever need to reinstall Mavericks you no longer will be able to re-download it. Thus, you would have to install Yosemite at that time. Note that you can download the Yosemite installer and save it somewhere. Simply Quit the installer application after the download rather than clicking on the Install button.
You may wish to assure you have a bootable clone of your Mavericks system should you not want to lose it. To do so requires an external or internal drive that can be completely erased and is equal to or larger than your current startup volume.
Clone Yosemite, Mavericks, Lion/Mountain Lion using Restore Option of Disk Utility
Boot to the Recovery HD:
Restart the computer and after the chime press and hold down the COMMAND and R keys until the menu screen appears. Alternatively, restart the computer and after the chime press and hold down the OPTION key until the boot manager screen appears. Select the Recovery HD and click on the downward pointing arrow button.
     1. Select Disk Utility from the main menu then press the Continue
         button.
     2. Select the destination volume from the left side list.
     3. Click on the Restore tab in the DU main window.
     4. Select the destination volume from the left side list and drag it
         to the Destination entry field.
     5. Select the source volume from the left side list and drag it to
         the Source entry field.
     6. Double-check you got it right, then click on the Restore button.
Destination means the spare drive. Source means the internal startup volume.

Prevent Retina iMac defaulting to 'mirror displays'

Hello! I have a Retina iMac (Yosemite) connected by Thunderbolt>HDMI adapter and HDMI cable to a Samsung 32" TV. How can I stop the iMac defaulting on start-up to 'mirror displays' (forcing it to a low resolution) despite deselecting 'mirroring' in display preferences? I will never use mirror displays and only ever need an extended desktop. Many thanks in advance

I just thought I'd answer my own question here, in case it is of any help to anyone!
I realised my iMac is just within the three-month Apple Care telephone support period, so I rang them up, and they were terribly helpful. We went through a number of elimination processes, and eventually the "don't mirror displays" preference was finally remembered by deleting the com.apple.systempreferences.plist file.
However, this was not actually the cure - one of the the processes we did to eliminate certain things was to set up a test account in addition to my own account. After doing this, naturally we had to disable auto login.
So after the euphoria of fixing the problem by deleting the .plist file, I hung up and deleted the test account and re-enabled auto login. And the problem returned!
So the problem actually lies within enabling Auto Login....so for the time being, I will leave it disabled. If anyone has an answer as to why this may be, I'd be ever so grateful to hear from you, as my dream scenario would be to re-enable it!

Multiple problems with new retina iMac. Suspect graphics driver

New retina IMac, top spec, with latest Yosemite, and additional Cinema Display attached. Having multiple problems which I suspect are being caused by the graphics driver:
The long running issue with Adobe PS whereby under certain size options the tools cursor disappears and just has the arrow cursor.
With no warning, after doing an action such as opening an application the system reverts immediately to the login screen and does not show me as logged in.
After switching users, a blank screen other than the cursor is shown. Seems I have to power off to get past this one.
Can anybody shed any light on any of these, at least so that I can discount my theory of a single culprit?

So I went onto the Adobe forums and found a number of threads on this subject. A staff member replied with the following:
It's a video card driver bug introduced in MacOS 10.10 (which looks a lot like an old bug they fixed in 10.9).
Apple is aware of this, and the other video driver issues in 10.10, and working on solutions.
So thanks to Adobe we now know.

IMac Retina 5K - Yosemite 10.10.2 - Update has killed my WiFi! (Before everything worked fine on 10.10.1)

Hello,
URGENT HELP NEEDED !
Imac 2014 Retina 5k with 4ghz Intel Core and 16GB Ram
Router : Netopia
Have upgraded this morning my iMac Retina to Yosemite 10.10.2. Before upgrade Wifi worked great, now since upgrade, I lose the wifi connection after a few seconds ! To get it back I have to (a) Reset the router (b) delete the wifi network from Network settings (c) restart my iMac
I then get the internet back for a period going from 20 seconds to about 5 minutes max!
In the router log I see on he MAC address of the iMac the computer connect itself, and then I see a message that says "Suspect Connection" and then another for the MAC address of the iMac being "Connection closed".
No tempory fixes work! I have discussed this with my internet provider (Swisscom) and they have done everything they can do on their side (change router channels etc...) but to no avail. They say this is an Apple issue.
I am going crazy !
Any solution is welcome ...
All the best,

Hello,
URGENT HELP NEEDED !
Imac 2014 Retina 5k with 4ghz Intel Core and 16GB Ram
Router : Netopia
Have upgraded this morning my iMac Retina to Yosemite 10.10.2. Before upgrade Wifi worked great, now since upgrade, I lose the wifi connection after a few seconds ! To get it back I have to (a) Reset the router (b) delete the wifi network from Network settings (c) restart my iMac
I then get the internet back for a period going from 20 seconds to about 5 minutes max!
In the router log I see on he MAC address of the iMac the computer connect itself, and then I see a message that says "Suspect Connection" and then another for the MAC address of the iMac being "Connection closed".
No tempory fixes work! I have discussed this with my internet provider (Swisscom) and they have done everything they can do on their side (change router channels etc...) but to no avail. They say this is an Apple issue.
I am going crazy !
Any solution is welcome ...
All the best,

Can I uninstall Yosemite from my iMac and reinstall Mountain Lion?

Can I uninstall Yosemite from my iMac and reinstall Mountain Lion?

For instructions see http://support.apple.com/kb/PH18846

I have Lightroom 3 and have installed it on my Retina iMac running Yosemite. It will not show me any of the modules..error when attempting to change modules.. and keeps asking for my serial number every time. Is it compatible?

I have Lightroom 3 and have installed it on my Retina iMac running Yosemite. It will not show me any of the modules..error when attempting to change modules.. and keeps asking for my serial number every time. Is it compatible?
David

This is a duplicate thread - see here

Wlan problem with iMac yosemite

When opening iMac it has difficulties to find WLAN network. I have to use network assistant several times and shut down the computer.
Sometimes there are no difficulties, sometimes i have to try half a dozen times.
My new iMac Yosemite was created by copying with Thunderbolt the contents of my old iMac, where I used in the beginning Airport.
Now I have cable modem.

Welcome to Apple Support Communities
The screen is damaged. Take it to an Apple Store

Any problems or downside with the 5K Retina iMac?

Aside from the price, are there any known downsides or issues with the Retina iMac? Such as excessive heat or fan noise? Does the Retina display slow down the computer?
Thanks.

My custom built unit finally delivered last Friday, and I admit I'm a bit concerned about the heat generated by this beast, and by the amount of fan noise I hear. A google search of "iMac 5K heat..." will bring up quite a few lively discussions about it on the web.
I've noticed significant fan noise, more so than the previous iMac's I have owned. This is just the computer doing its job mind you, but the rapidity of how fast things get hot is alarming to me. Testing almost any modern video game (WOW, Diablo 3, LOL, HOTS, etc.) kicks the fans in within 60 seconds, as does watching 1080p fullscreen videos on YouTube using Chrome (have not tested this in Safari since I don't install Flash, so I blame Chrome for this.)
Of course "excessive" is subjective to the individual ear, what bothers some may not bother others. With my previous iMacs (going back to 2008) the machine would get so hot playing some games and the fans would not rev up enough to adequately cool the machine. Many times the iMac got so hot it shut itself off to prevent damage, forcing me to use SMCFanControl to regulate it myself. Apple wanted the iMac to be quiet, but it did so to the point of hardware failure, which was a big source of frustration for users back then.
They seem to have addressed that portion of the issue with this model, because I can't recall ever hearing the fans come on anywhere near as fast. I don't feel an alarming amount of heat on the back of the chassis, which is good, but for me the fan noise is definitely noticeable.
There are a couple of other threads about the GPU getting hot enough to cause concern (GPU Heat iMac 5k 105degrees C) if you are looking for other sources of information.

Track pad problem with retina iMac

I have a brad new 27" Retina iMac - I selected the wireless keyboard and trackpad. The trackpad seems to drop it bluetooth connection after the iMac sleeps - limited functionality is still available but System Preferences (both trackpad and Bluetooth) claim they cannot find a trackpad. Apple Support have said this issue has been reported a number of times but all suggestions do not help. My new iMac is 2 days "old" - I'm almost ready to send it back under the 10-day return policy and wait a couple of months until this issue is fixed. Can anyone help???

I wrote too soon. No matter what I do, I can no longer swipe between pages with my track pad. The mouse works fine. I can get to mission control with a three or four finger gesture depending upon how I set it in preferences.
I see how I got caught with the 3 and 4 finger swipe settings: the preferences panel makes sure you don't try to do two things with the same setting and will automatically revise settings accordingly. Logical enough.

I have a mid year 2007 24 inch iMac and will be purchasing a new 27 inch Retina iMac, what is the easiest way to transfer the data and files from my old machine to the new one?

I have a mid year 2007 24 inch iMac and will be purchasing a new 27 inch Retina iMac, what is the easiest way to transfer the data and files from my old machine to the new one?

Following up on this thread,
I have a new iMac on the way and my current is from 2008, never had a problem but I am sure there are internal issues that I would prefer not to transfer.
I have no issues other then the slowness in certain programs and that is the main reason to buy a new one.
Programs like numbers and pages seem to take a longer time to open after I update to Yosemite.
I only use 272GB of 500 GB, my memory is 4GB and I am upgrading to 8Gb and bought the 4.0 processor.
Question:
Is there a way to manually transfer items or would that be a waste of time in that if there are issues they could be anywhere and would transfer anyway?

Trouble Connecting 30" External Display to Retina iMac

I'm trying to connect a 30" display (Dell U3011) to a new retina iMac.
On my old Mac Pro (using the DVI connection), the display would connect at 2560x1600 as expected.
On the new iMac (using the MiniDisplay Port to DVI adapter) the display will only connect at 1920x1080.
Am I doing something wrong? Is the lower resolution a limitation of the MiniDisplay Port? Yosemite?
Thanks.

Thanks. I figured out the problem, which amounts to RTFM: Mini DisplayPort to DVI doesn't support 2560x1600, but either a dual-link adapter (http://www.amazon.com/dp/B001IF252C), or a Mini DisplayPort to DisplayPort cable, works just fine.

My new Retina iMac not looking great and my companion monitors look horrible !

I have been running late 2013 iMac i7 27" and loving it for the last 8 months. I decided to upgrade and went and bought the Retina iMac yesterday and upgraded the ram to 16Gb.. 2699 not too bad.
Excited as can be I got it home and hooked it up only to be dumbfounded and disappointed that the 2 Samsung 21" 1600X1200 monitors that I have been running for years and years as my companion monitors with my iMac do not look right. They look fuzzy and almost like the res is wrong. Its finding them fine and showing them at 1600X1200 no problem but they look horrid.
They looked fantastic on the 2013 iMac 27 I have been using.. They are hooked up with Thunderbolt to DVI adapters and I have one on the left and one on the right of the 27" screen. I have been using this config for years and years and now I can't ..
I think not only is it the new GPU and the way its handling the external monitors I think Yosemite is causing some of this as well.
When I go into Accessibility and turn on enhanced contrast it gets a little better but still not good..
I also notice that sitting at a few feet from the screen in my normal position reading text on the Retina is not good for my 49 year old eyes. The text is smaller and just not as punchy as it was on the 2013 iMac. Is this a case of too new to jump on technology ?
I really don't want to return it and go back to a standard 27 but i might have to.
Funny some of the articles i have been reading say for graphics editors and photo people its great but for text users its not that great and I am seeing this might be the case.
I unfortunately got rid of the 2013 iMac already and I can't get it back..
Any help would be appreciated
Craig

You have a brand new Mac with AppleCare support.
If you can't bring your entire system into an Apple store, if you live within 50 miles of an Apple store, you can call Apple an make an appointment to have a tech come to your location and help you sort out the issues with your setup.
You, also, have free phone support for 90 days, also.
1-800-MYAPPLE
Good Luck!

I have a brand new iMac, Yosemite 10.10.1, Java Version 8, Update 25, however, I still get a window when I open Adobe Photoshop CS5, that indicates that I need to install Java SE 6 Runtime. Any suggestions?

I have a brand new iMac, Retina 5K, Yosemite 10.10.1, with Java Version 8, Update 25, however, I still get a window when I open Adobe Photoshop CS5, that indicates that I need to install Java SE 6 Runtime. Any suggestions?

Java should be downloaded directly from Apple:
Java for OS X 2014-001

Retina iMac Yosemite reinstall problems

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