Start up problems with iMac

when re connecting the power and pushing the on button, the typical start up sound is produced but the screen stays white. After a few moments the 'file' icon appears in the middle of the white screen with a question mark flashing in this icon.

Hello Veke,
Try holding the Option or alt key down at bootup, what shows as boot choices?

Similar Messages

I had a problem with imac screen going black. apple store diagnosed prob with video card which they replaced. Brought it home, turned it on (have done this 4 times) it starts up, wheel turns, there is a long bar at bottom which fills up, then it turns off

I had a problem with imac screen going black. apple store diagnosed prob with video card which they replaced. Brought it home, turned it on (have done this 4 times) it starts up, wheel turns, there is a long bar at bottom which fills up, then it turns off

Apple guarantees their work, take it back.

Start-up problem with hp pavilion dv6t-7000‏: "Boot Device Not Found. Hard Disk (3F0)" error

I started getting start-up problems with my hp pavilion dv6t-7000‏. It happens intermittently.
The boot error is:
Boot Device Not Found
   Please install an operating system on your hard disk.
   Hard Disk (3F0)
   F2 System Diagnostics
   For more information, please visit: www.hp.com/go/techcenter/startup
Could a faulty BIOS update cause this problem?
Anyone else who may have experienced a similar problem?
I'd appreciate any help about this problem. Thanks.

Hi
Please find the link given below might help you to fix your issue.
Resolve Boot Device not Found Error Message
Let us know how it goes!
"I work for HP."
****Click the (purple thumbs up icon in the lower right corner of a post) to say thanks****
****Please mark Accept As Solution if it solves your problem****
Regards
Manjunath

I have a problem with Imac mid 2010 graphics card (ATI Radeon 5670 512MB)

I have a problem with Imac mid 2010 graphics card (ATI Radeon 5670 512MB). When I play video formats like xvid, mkv, avi iMac freezes and emits horrible sound,in service said the problem is not overheating. Not a problem with memory or hard disk because I placed second correct parts.The same problem is with OSX 10.6.8 and 10.8.4 and other players.Apple hardware test found no problem and tech tool pro found no fault.
After five days of testing in the service they can not found fault and it was decided to change the graphics card.
New graphics have been tested for two days but it is not reproduced divx ... but their test software which did not find any fault on the old graphics...
Do I have the right to complain if repair does not fix the problem because I use non apple softwere and video formats.

You could look at the System Profile for the info it presents for the card. But why wouldn't you think it's not up to date if you have the latest install (according to your sig above)?
What program are you trying to run? Is there anything in the system log?
I think it's the program that's having the problem and not anything with your video software.

Start-up problem with the Z10

Can you assist us in a Start-up problem with the Z10's.
I have read a lot of complains with the Z10 starting-up and then got stuck at 98% completion. No further response after that!
For any further information please check the "BlackBerry Support Forum" on this same site.
Please respond or tel me who i can contact in this regard?
Thank you
Kobus69
Subject Title and beginning of post edited to reflect new topic.

Hi
Please find the link given below might help you to fix your issue.
Resolve Boot Device not Found Error Message
Let us know how it goes!
"I work for HP."
****Click the (purple thumbs up icon in the lower right corner of a post) to say thanks****
****Please mark Accept As Solution if it solves your problem****
Regards
Manjunath

Problems with iMac retina 5K (artifacts, glitches and etc.)

Hello dear Apple.
I have bought new iMac with retina 5K display and I have found lot of problem with it. It was December 2014 when I got my first iMac. And after then I have found few real problems with it.
The first problem is I can't open high resolution image with standard Preview.app. I mean 'high resolution' - more then 30-40 megapixels. When I open them, I can see image, but only 2-3 seconds, and after that I see horizontal artifacts only. I can't open images, like this Rembrandt.jpg; Carpaccio.jpg; Holbein.jpg
The second problem, when I change resolution in to scaled mode (System Preferences/Display) for increase image on display. I found when select some area on background of desktop it has left some lines after itself. It is particularly unpleasant if you have plain colour desktop background. You can view, how does it look here.
The next problem with animation in different parts of interface, e.g. sometimes when I open Time Machine some parts of windows are freezing or appear some artifacts or glitches near borders of window. And I have the same situation, when I open Mission Control, or any Adobe app or other, or simply rename a files. I have found few discussions with problems like mine, but in the separate places
5K iMac - bad GPUs?
Graphic Problems with Retina iMac
iMac 5K and indesign glitch
And after that I want to tell you that I have this problems on four (4) iMacs. It was really difficult to arrange four replace. I have lost a lot of time an spent a lot of nerves for discuss and resolve my problems with Apple support. Finally, they told me that they do not know about problems with iMacs, and they could offer give my money back. I glad to get my funds, but now in my country price for iMacs has doubled. And if they refund my money, I can buy half new iMac only.
I am sorry for my language and style, but I do not know what I should doing with that. And should I hope, that my problem resolve with OS X updates? Or it is hardware problem of the whole iMacs 5K...

Yes Ralph, absolutely correct, 4 times. Do you have the graphic card the same as me, or m290? Could I ask you check your iMac for few things, please?
For the first, can you enlarge scale in System preference/Display and install plain dark color desktop background. Are there any footprints after rectangular selection like in my video https://youtu.be/dBglFvjJx1Q?
And for the second, could you download this image https://upload.wikimedia.org/wikipedia/commons/0/07/Rembrandt_Harmensz._van_Rijn _-_Nachtwacht_-_Google_Art_Project.jpg and open in plain Preview.app, and zoom it? Are there any glitches?
Thank forward.

Hi everyone. I have just started having problems with iCal. Events that I thought I had deleted are appearing on Print Preview and on print outs. Likewise Events which I have not deleted have disappeared from my calenders, but appear in print preview.

Hi everybody. I have recently started having problems with iCal (Version 2.05 (1069). Events that I thought I had deleted appear in Print Preview and Print Outs. Likewise Events that I have not deleted have disappeared from my calender (Month View) but appear in Print Preview and Print Outs. I see that there have been similar problems with Events disappearing especially in Month View. I wondered how print preview seemrd to be picking everything up deleted or not, and what the solution may be?. First time of Posting. I hope I haven't embarassed myself.

Hmmmm.
At the very least there must be a "com.apple.ical.plist"...iCal would not function without it.
Click on the Finder icon in the dock
Click on Go > Home
Double-click Library
Double-click Preferences
Look for a file called "com.apple.ical.plist" and remove it to the trash.

Problems with iMac G5 not starting properly

Hello!
I am having troubles with my iMac G5 + iSight. It will only start in safe boot, and when it does it has some funny lines across the screen.
I know that it is not a hardware problem particularly because it used to boot fine sometimes and then only in safeboot.
I am wondering whether it is a firmware problem, or I need to reinstall the OS. I think it is a firmware problem because when I press option key on startup, that has the funny lines as well, so it may well be.
If anyone could please tell me where I can download a firmware updater/reinstaller and how to do it, I think it may fix the problem.
Thanks!

I do not know why your iMac has lines on it. As for not booting in normal mode, there are lots of cauuses for that. None of the causes has to do with firmware.
I suggest you take it to an Apple store.
I am having troubles with my iMac G5 + iSight. It will only start in safe boot, and when it does it has some funny lines across the screen.
-- I do not know why the lines are there. May indicate a problem with lcd.
-- Could you try attaching another monitor to the iMac. there is a mini-vga port.
I know that it is not a hardware problem particularly because it used to boot fine sometimes and then only in safeboot.
-- how do you know this? Working in safe mode doesn't use the video chip. Normal mode does. Bad video chip is suspected.
I am wondering whether it is a firmware problem, or I need to reinstall the OS. I think it is a firmware problem because when I press option key on startup, that has the funny lines as well, so it may well be.
-- You like to rule out hardware problems. My reading would be this is an indication of a bad lcd or cabling.
-- I'd re-install os. Could be a corrupt hd or bad hd. I'd erase the entire drive & reinstall.
Sometimes if volumes don't appear in Startup Manager (what you get when you hold down the Option key at startup), you need to reset the Mac's PRAM, NVRAM, and Open Firmware. Shut down the Mac, then power it up, and before the screen lights up, quickly hold down the Command, Option, P, and R keys, until the Mac has chimed twice more after the powerup chime. Then, before the screen lights up, hold down Command-Option-O-F until the Open Firmware screen appears. Then enter these lines, pressing Return after each one:
reset-nvram
set-defaults
reset-all
"The reset-all command should restart your Mac. If so, you have successfully reset the Open Firmware settings."
http://support.apple.com/kb/TS1812?viewlocale=en_US
How to eject a cd from the internal cd drive:
eject cd
List of devices:
devalias
List of variables:
printenv
If anyone could please tell me where I can download a firmware updater/reinstaller and how to do it, I think it may fix the problem.

Airport problem with iMAC 27" and serious service support for indonesia

Hi all,
i can't seem to get any help from anywhere else. so i try to post it here.
i tried to call the apple store (indonesia) which i bought this imac 27" from. got transfered 4 times and i had to explain it to them all over. in the end i got to speak to the technician and i asked whether i can get a replacement and they don't think it's the correct solution and leave me hanging here.
the apple store is listed as an apple authorized service provider (AASP) or apple authorized distributor (AAD):
iBox by Padang Digital Indonesia - Apple Authorised Service Provider
Puri Imperium Office Plaza, (Belakang Menara Imperium)
Jl. Kuningan Madya Kav. 5-6, Jakarta
12980
Tel: 62 21 8370-iBox (4269); 830 6763
Fax: 62 21 830 6730
Email: [email protected]
Web: http://www.ibox.co.id
i called the apple support on the apple.com (0018 03061 2009 for indonesia) today wednesday 19 may 2010, time 1:12pm indonesia local time (GMT +7) i didn't get the guy's name but i can tell he's Indian from the accent, i told him what the problem is, he told me to wait, i waited for 10 minutes and he hung up on me at 1:24pm. please check on the record, because i was told the whole conversation was recorded.
so, let's go to the problem:
i can't share my internet with airport built-in in my imac 27".
I'm using ZTE usb hsdpa modem connected to the imac. (fyi, my friend is using the same exact modem and internet provider and don't have any problems with internet sharing using his macbook)
i tried to share the internet through the airport express simply with these steps:
1. open the system preferences, internet sharing,
2. connection with "ZTE usb modem", and the box next to "Airport" is ticked
3. turn on the internet sharing
4. press start
5. yes the firewall is off.
and these are what i'm having right now:
1. the airport symbol wont turn into an arrow
2. when i open the network preferences, it says: AirPort is turned on but is not connected to a network. (color is orange not green)
3. i searched the wireless network with my ipod touch and i found nothing
4. if i try to "create a network" here's what it says "There was an error creating your computer-to-computer network."
5. this are the details on the airport card:
Software Versions:
Menu Extra: 6.2 (620.24)
configd plug-in: 6.2 (620.15.1)
System Profiler: 6.0 (600.9)
Network Preference: 6.2 (620.24)
AirPort Utility: 5.5.1 (551.19)
IO80211 Family: 3.1 (310.6)
Interfaces:
en1:
Card Type: AirPort Extreme (0x168C, 0x8F)
Firmware Version: Atheros 9280: 2.1.9.5
Locale: RoW
Country Code:
Supported PHY Modes: 802.11 a/b/g/n
Supported Channels: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 36, 40, 44, 48, 52, 56, 60, 64, 100, 104, 108, 112, 116, 120, 124, 128, 132, 136, 140, 149, 153, 157, 161, 165
Wake On Wireless: Supported
Status: Not Associated
and yes, i've updated all the airport software and i stick on the 10.6.2 os.
It seems like people who has this latest imac 27" also having problems with the airport express. and they somehow got a replacement.
http://discussions.apple.com/thread.jspa?threadID=2261196&tstart=0&messageID=109 80828
so, i really really appreciate if i can get help here.
many thanks and best regards,
irene

If you have anything configured in System Preferences/Network/Airport then you have conflicts configured into the network. I suggest that you start from the beginning. Do not assume anything. Do not take any short cuts. Start fresh.
Go to Sys Prefs/Sharing turn off Internet Sharing. Go to Sys Prefs/Network, highlight AirPort and press the - symbol below to remove the AirPort interface. Now press the + symbol and create a new AirPort Interface. In the new AirPort interface do not turn on AirPort. You should only select the box to show AirPort Status in the menu bar. Now press Apply.
Go to Sys Prefs/Sharing and follow the steps 1 through 11 in my first post.
In step 11 Sys Prefs should ask you to turn on AirPort. Turn it on. It should next ask you to start Internet Sharing. Start Internet Sharing.
The AirPort Status in the menu bar should show AirPort is on and have an arrow pointing up. In the AirPort Status dropdown menu it should show AirPort is ON, Internet Sharing is ON and it should show the name of the Internet Sharing network that you created.

Reboot problems with iMac dual intel 1.83 OS 10.4.6

Needing help. Mac user since 1999 but I'm feeling like a novice with this. Wife was playing Sims 2 when it locked up and wouldn't allow the game to be turned off. Did a forced restart, disk went to the grey screen with the spinning gear for an extended period. Went to bed and the next morning the blue screen was on with OS X label as if computer was booting successfully but the hard drive sounded as if it was stuck in a loop. Got the installation disc and figured out how to eject the game and install the disc. Did safe boot and computer will goto the grey screen with the spinning gear and then will turn itself off.
Tried to reinstall OS X 10.4.4 while archiving in a separate folder and after verifying the disc the install fails. Ran hardware check came back o.k. Tried to boot from install disc and it just takes me back to the install disc start-up. Ran disc utility to repair premissions and it hung up after 30 minutes and the hard drive sounded like it was stuck in a loop. Ran disc utility to repair hard drive, first checks came back o.k. and then stated it was not completed due to an underlying issue when it tried to back out.
The hard drive is partitioned from boot camp, deleted windoze and tried to install OS X on the 20 gigs partitioned. The disc again verified but then failed- which threw me for a loop (does not appear dirty or scratched). My intention was to boot up on the partition and then try to retrieve pictures and videos on the hard disc, unfortunately only 1/2 is currently backed up.
I have not tried fsck yet because I was confused how to get to it, I think I am supposed to use the start up disc and go to the terminal application then enter the command, is this correct?
Unfortunately I am having to type this at work while the computer is at home- so if there are suggestions please dump them on me and I will try all of them tonight. No broken folders, kernal panics or exclamation points thus far.
Thanks for all the help.

Welcome to Apple Discussions!
When you verified with disk utility the disk, you basically ran fsck. Permissions are another factor here, but the fact it failed the disk check suggest major directory problems with the hard disk. Unfortunately the only third party directory repair utilities that I know work well currently are for PowerPC Macs only. If you have another Mac, suggest putting the iMac in target disk mode and see if it is seen by the other Mac. The target disk mode is described by this article:
http://docs.info.apple.com/article.html?artnum=58583
If it is, then you can recover your data.
If it is not, my suggestion is to get an external Firewire hard drive, and Prosoft Data Rescue and see if it is able to recover the information to it.
http://www.macsales.com/ sells equivalent Firewire hard drives for good prices, and http://www.prosofteng.com/ is where to get Data Rescue.
In addition, there may be suggestions people in the Boot Camp forum can offer:
http://discussions.apple.com/forum.jspa?forumID=1165
My suggestion is to find a way to completely and safely remove Boot Camp and only use it on non-production machines.
I don't think your problem is an online networking issue, which I see you posted in that forum.

HT6400 Problems with IMAC ( 10.9.5) update

I already started a chat with Eric Root which didn't resolve anything ( but he seems to have disappeared!) . OriginallyI thought that my problems following Mavericks update a few days ago to 10.9.5 were limited to e mail but I now realise that neither Notes or Calendar are updating or synching with iPhone or iPads.
In terms of what I can establish, the IMAC IS connected to the internet and all passwords are correct . I have changed nothing on set up . The e mail account settings ( account name, type, incoming server , user name , p/w, and outgoing server , advanced settings i.e. port etc ) are exactly as they were before the mavericks update ( and exactly the same as my macbook which is still running 10.9.4!
Can somebody advise what action either I need to take or are you experts at Apple on the case ?
Help !

These Apple documents will explain how:
Intel-based Macs: Resetting the System Management Controller (SMC)
OS X Mavericks: Reset your computer’s PRAM
How did you update to 10.9.5? From the App Store. If so you might try downloading and manually installing the OS X Mavericks 10.9.5 Update (Combo). When available I prefer to run the combo updater.

Firmware problem with imac

hello, i have a problem with my imac 27 inch, late 2009 (11,1). it doesn't starting after the firmware update. with firmware restoration can i use?

If you cannot get it to boot you will need to take it into an Apple Store or AASP to be fixed.

Screen Problems with iMac G5 20" (iSight)

Hello!
I had the same problem with my iMac G5 20" (iSight) as described by Bob North Apr. 18, 2006 at http://www.macintouch.com/readerreports/imacg5/topic2276.html#apr25:
"""" I repair Apple products, and recently I've seen strange and erratic display problems with the G5 flat-panel (iSight) 17" and 20"...and I am very curious about the origin. The picture will display what I will call "plaid pixles". Upon boot, the dispaly appears normal, but within 5-10 minutes, either at desktop or in ASD, the normal display will "crash" to the "plaid" display. The desktop, or whatever, can still be distinguished in the background, but it is overwashed by the plaid patterns -- which do change slightly, and also cover the full space of the screen. I've seen different scenarios, 3 in 2 weeks, where the symptom is exhibited with no particular failure pattern -- both before and after repair. I've replaced the main logic on one occasion, with no fix...but the 2nd try replaced both display panel and inverter. The display issue was fixed, but the system exhibited lockups only when it reached the destop. Another repair the same issue was seen after replacing the 20" main logic, where the symptom was not present previous. Personal opinion of the late 2005 IMAC flat-panels, in the hardware sense, is the likelihood of component manufacture issues, possibly the main logic boards or the panel displays themselves. Repair of this model, as opposed to the earlier, non-iSight flat-panel 17 and 20" models are extremely difficult -- access to main componenets is blocked by the display panel, which must be removed for each troubleshooting attempt. The internal hardware design is not oriented for repair ease...they are by far the most difficult to work on.
Any input regarding the display issues? Thanks.""""
I can't use the mouse or anything else, and after a while the fans start to go on max. This is the second time I encounter this problem within 30 days. What I have noticed is that the day before, the brightness of the screen started to "blink" slightly -- like if the screen tried to adjust itself.
But I haven't experienced what Bob North describes as the: "Upon boot, the dispaly appears normal, but within 5-10 minutes, either at desktop or in ASD, the normal display will "crash" to the "plaid" display".
I just restart with the power button and everything is working OK. I made an Extended Hardware test without any problems detected.
I have been looking for this issue with iMac G5 20" (iSight) and only found it at http://www.macintouch.com/readerreports/imacg5/topic2276.html#apr25 :
Apr. 18, 2006
bob north
I repair Apple products, and recently I've seen strange and erratic display problems with the G5 flat-panel (iSight) 17" and 20"...and I am very curious about the origin. The picture will display what I will call "plaid pixles". Upon boot, the dispaly appears normal, but within 5-10 minutes, either at desktop or in ASD, the normal display will "crash" to the "plaid" display. The desktop, or whatever, can still be distinguished in the background, but it is overwashed by the plaid patterns -- which do change slightly, and also cover the full space of the screen. I've seen different scenarios, 3 in 2 weeks, where the symptom is exhibited with no particular failure pattern -- both before and after repair. I've replaced the main logic on one occasion, with no fix...but the 2nd try replaced both display panel and inverter. The display issue was fixed, but the system exhibited lockups only when it reached the destop. Another repair the same issue was seen after replacing the 20" main logic, where the symptom was not present previous. Personal opinion of the late 2005 IMAC flat-panels, in the hardware sense, is the likelihood of component manufacture issues, possibly the main logic boards or the panel displays themselves. Repair of this model, as opposed to the earlier, non-iSight flat-panel 17 and 20" models are extremely difficult -- access to main componenets is blocked by the display panel, which must be removed for each troubleshooting attempt. The internal hardware design is not oriented for repair ease...they are by far the most difficult to work on.
Any input regarding the display issues? Thanks.
Apr. 19, 2006
Robert Mohns
bob north describes: "...recently I've seen strange and erratic display problems with the G5 flat-panel (iSight) 17" and 20"...and I am very curious about the origin. The picture will display what I will call "plaid pixles". Upon boot, the dispaly appears normal, but within 5-10 minutes, either at desktop or in ASD, the normal display will "crash" to the "plaid" display. The desktop, or whatever, can still be distinguished in the background, but it is overwashed by the plaid patterns -- which do change slightly, and also cover the full space of the screen."
Does it look anything like this?
http://downwardspiral.net/gallery/pbg4-display
My nearly 3 year old Titanium PowerBook G4 just did this one day, out of the blue. The problem went away after a few minutes, but I had already taken photos. Thanks to those photos, Apple gave the powerbook a new logic board.
(This PowerBook has had its logic board replaced twice, a new optical drive, and a cracked case edge replaced. AppleCare has more than paid for itself. Despite the occasional problems, I remain very happy with this machine. I'm sure I'd be much less happy if I had not bought AppleCare!)
Hubert

Hubert Frank,
To Apple Discussions!
What troubleshooting methods have you tried to solve your issue?
The knowledgeable users will need this info to avoid the "been there, done that" senerios.
Have you tried the methods mentioned in the following Knowledge Base Article?
http://docs.info.apple.com/article.html?artnum=301283 Troubleshooting when there's no picture on the display
Do you have AppleCare? If so, have you contacted them? If so, outcome?

Many problems with Imac

I've had my iMac for a little over a year and now I am having problems with programs not opening, but then not being able to close. the arrow is under them but no matter how many times I force quit it won't close. Happens mainly with Toast and Itunes. Also, sometimes the computer will go to sleep and I can't get it to wake up. when this happens the fan just goes crazy. I have reset permissions and verified permissions. I have run the OSX disk with hardware utility and everything checks out fine. Will I have to reformat or just not use it anymore?
Jason

Jason -
Sometimes zapping the P-RAM helps:
1. After the startup tone, hold down <cmd><opt><r> until 3 additional startup tones are heard, then release the 4 keys.
Sometimes doing the Open Firmware resets helps:
1. After the startup tone hold down <cmd><opt><O><F> until a text screen appears (that's the letter Oh, not the number zero).
2. When you can start typing, enter the following commands, following each command by pressing <return>.
reset-nvram
set-defaults
reset-all
The mac will start normally at this point.
If still not successful, try this as well:
After the startup tone, hold down the <shift> key until you (hopefully) reach the desktop. This start is called "Safe Start" and it will be longer than normal, because Disk Utility's "repair" is invisibly run; it also will bypass any login items. If the system gets to the desktop OK this time but stalls when the shift key is NOT held down, the problem may be some login item that will need to be removed, using the Accounts panel of System Preferences and its Login Items section.
If none of these suggestions work, you may be required to perform an Archive and Install re-installation of the Mac OS. This is one of the options presented by the OS installer when you run it, and it preserves all your settings, data and added programs, but puts a new copy of the OS on the hard drive from which to boot.
Please let us know how you make out,
Miriam

General Problems with iMac 9,1 's

There seems to be a disturbing trend as of the last two OS releases, Mavericks and Yosemite, and it involves a lot of iMac 9.1's. You see a lot of reports of sudden shutdowns, kernel panics, graphics issues, Safari crashes, Messages woes...and the list goes on. I have an early 2009 iMac 9,1 with 8GB RAM and an nVidia 130gt 512 Mb. With the release of Mavericks 10.9.4, I started getting the Sudden Shutdown Syndrome (machine powers down with no warning, like the power cord was pulled). After doing the required switching of power cables, using different RAM, switching of UPS's, opening the computer to clean it, etc..., I thought it might be a problem with either the power supply unit, the graphics card, or the logic board. Unfortunately, I'm overseas in a country that doesn't have an Apple Store so an easy repair option isn't available to me.
Pressing forward, I noticed that I didn't get any crashes or shutdowns in Safe Mode. Granted, only subset of the extensions are loaded, but if it was a flaky PSU or logic board, it would seem that it would show something at some point. And, the thing about graphics cards is that when they go bad, they start to leave artifacts and pixilate, and that wasn't happening in full boot or safe mode. I also noticed that in full boot mode, I could repeat certain actions that would cause a shutdown 100% of the time. I have also read reports where people had the logic board, graphics, and/or PSU changed out, the problem went away for a bit, then came back!
I'm now thinking that this is a software conflict that specifically affects iMac 9,1's and Macs of similar architectures. I'm fairly convinced of this because when I entered the Yosemite Public Beta Program (I was desperate to get a fix), I noticed that with each release, certain actions that would cause 100% failure/shutdown were gone, while others remained. When I installed Public Beta 5, and did a cache cleanup...MY SHUTDOWN PROBLEM WAS GONE! All the actions that used to crash the machine didn't work anymore. If it was a hardware problem, it would seem like the shutdown problem would still be present.
But, alas, mine is still a tale of woe. When I installed Public Beta 6, THE SHUTDOWNS RETURNED! When I looked at the release notes, it mentioned unspecified driver changes. Hmmmmmmm. Unfortunately, Public Beta 6 was the GM so when I downloaded the Yosemite Final Release, nothing changed...same old crashes.
So, what do I think is happening? I'd bet my bottom dollar that the problem lies in the interaction between the GeForceTesla driver, the kexts which control the power management of the graphics cards, and the system/user cache files. I think if Apple investigated those areas, a solution may be found. Also, I wish they would go back to Public Beta 5 and see why that release was so stable for iMac 9,1's (at least for mine anyway).
However, if anyone else has any insight to these problems, I'd love to hear it.
As a side note, Safari (along with my system) crashes frequently while Google Chrome Canary 64-bit is as solid as a rock. And, again, I experience no crashes in Safe Mode, even with using Safari.

I have an iMac9.1 24" and had no issues in Mavericks and have no issues at all in Yosemite. So it seems to rule out hardware-problems.

Start up problems with iMac

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