iMac freezing during boot

Discussion in 'iMac' started by Jamsen, Dec 29, 2010.

  1. Jamsen macrumors newbie

    Joined:
    Feb 16, 2010
    #1
    I cannot boot my iMac as it started freezing on the grey screen with the apple logo. Just before the spinning wheel freezes I see a flash of yellow on part of the screen (or some other screen corruption if booting via installation disc).
    Sometimes the mac doesn't even boot, I hear the hard disk spin up and the cd drive initialise but the screen stays black.

    What could be the problem?

    thanks.
     
  2. DanielCoffey macrumors 65816

    DanielCoffey

    Joined:
    Nov 15, 2010
    Location:
    Edinburgh, UK
    #2
    How old is your iMac and are you covered under 1-yr warranty or AppleCare? If so, you need to take it in for inspection.
     
  3. Jamsen thread starter macrumors newbie

    Joined:
    Feb 16, 2010
    #3
    Apologies in my haste, its a 24" 3.06GHz and well out of its 1year warranty! :(
     
  4. Teqnilogik macrumors member

    Joined:
    Sep 16, 2010
    #4
    Try unplugging all USB devices and see if your iMac still freezes on boot up.
     
  5. 87vert macrumors 6502

    87vert

    Joined:
    Oct 7, 2008
    Location:
    Pittsburgh, PA
    #5
    Try resetting the PRAM:
    Command-Option-P-R keys

    Try booting into "safe mode":
    After you hear the startup tone, hold the Shift key.

    If you can get into safe mode you can try and run a verify disk permissions and verify disk.
     
  6. Jamsen thread starter macrumors newbie

    Joined:
    Feb 16, 2010
    #6
    Resetting PRAM doesn't seem to work and booting in safe mode freezes too. There is also nothing plugged into the mac except the power lead.
     
  7. SandboxGeneral Moderator emeritus

    SandboxGeneral

    Joined:
    Sep 8, 2010
    Location:
    127.0.0.1
    #7
    It's probably a hard drive failure; a bad sector somewhere which corrupted the OS. Do you have a current Time Machine backup? If so, you can replace the hard drive and then reinstall the OS and use Migration Assistant to restore your applications, preferences and files from Time Machine.

    Or... if you have access to a Windows PC, you can take the HDD out of your Mac, connect it as a secondary drive to a PC and then use Spinrite on it. It may fix or mark any bad sectors and can get your machine back online. If you do and it works, make sure to get a Time Machine backup done ASAP and replace that drive.
     
  8. Jamsen thread starter macrumors newbie

    Joined:
    Feb 16, 2010
    #8
    I replaced the HDD about 6-8 months ago with a new WD. Do you think it really could be that again? The symptoms are slightly different than last time. This time is seems to have video corruption whereas before it would just plain freeze.
     
  9. SandboxGeneral Moderator emeritus

    SandboxGeneral

    Joined:
    Sep 8, 2010
    Location:
    127.0.0.1
    #9
    Its always a possibility. There is always a percentage of HDD's out there that will fail within the first 6-12 months. It's all statistics based on volume.

    I've bought in the past, brand new HDD's, power supplies etc... that were bad right out of the box.
     
  10. Jamsen thread starter macrumors newbie

    Joined:
    Feb 16, 2010
    #10
    Well I actually hope that that is the problem, as it would be the cheapest to fix. I will check out the hard drive when I have the parts to do so. But is there anything else I can try now?

    EDIT: I did run a disk check when I noticed the machine acting weird and nothing was wrong with it. I can also boot into FireWire disk mode.
     
  11. SandboxGeneral Moderator emeritus

    SandboxGeneral

    Joined:
    Sep 8, 2010
    Location:
    127.0.0.1
    #11
    You said you replaced your drive 6-8 months ago, can you put your old one back in and see what happens?

    ALSO: Since the newer drive is under 1 year old, you may be entitled from the manufacturer to get a replacement one, since (if) this one is defective.
     
  12. Jamsen thread starter macrumors newbie

    Joined:
    Feb 16, 2010
    #12
    The other drive has been discarded, I no longer have it. My new drive has a 5 year warranty so there should be no problem there, however I have a feeling it's not the HDD.
     
  13. SandboxGeneral Moderator emeritus

    SandboxGeneral

    Joined:
    Sep 8, 2010
    Location:
    127.0.0.1
    #13
    What do you suspect the problem is?
     
  14. Jamsen thread starter macrumors newbie

    Joined:
    Feb 16, 2010
    #14
    I dont know but it's acting differently than last time and there is obvious video corruption just before every crash.
     
  15. SandboxGeneral Moderator emeritus

    SandboxGeneral

    Joined:
    Sep 8, 2010
    Location:
    127.0.0.1
    #15
    Could be the logic board. Did you have any of these problems prior to changing HDD's?

    You said it's past it's 1 year warranty, but do you have Apple Care?
     
  16. Jamsen thread starter macrumors newbie

    Joined:
    Feb 16, 2010
    #16
    Not buying apple care is my biggest regret. :(

    I suppose I'll have to drag it down to an apple store to get it diagnosed and sent off for repair. How can I back it up while it's in this state?
     
  17. SandboxGeneral Moderator emeritus

    SandboxGeneral

    Joined:
    Sep 8, 2010
    Location:
    127.0.0.1
    #17
    I doubt you can back it up at this point. If you had access to a HDD duplicator, you could probably do it.
     
  18. Jamsen thread starter macrumors newbie

    Joined:
    Feb 16, 2010
    #18
    I've just managed to find my original install disc and Ive just started a diagnostic test. Hopefully this will shed some light on what's wrong.

    If I take it to the apple store what other tests would they do?
     
  19. SandboxGeneral Moderator emeritus

    SandboxGeneral

    Joined:
    Sep 8, 2010
    Location:
    127.0.0.1
    #19
    I don't know, I have no experience with that. I'm sure other MR members can advise.
     
  20. Jamsen thread starter macrumors newbie

    Joined:
    Feb 16, 2010
    #20
    I've just been into the apple store and he ran some diagnostics, that all came up clean. He couldn't boot it from his external drive and was unable to offer a solution there and then. He suspects that it is a logic board problem but has kept it for some overnight testing... Let's hope it's not the LB as it's going to cost £460 to fix ):
     
  21. Muttley1900 macrumors newbie

    Joined:
    Dec 27, 2010
    #21
    Now hold on a second... How old is this machine? and how much did you pay for it?

    I have to ask, because just because it is out of "warranty" doesn't make it automatically your problem.

    I'm assuming this is a UK purchase as you quoted the repair costs in £s.

    I had bought a LCD 22" tv and within 18 months (so 6 months past the guarantee) the sound failed on it. I contacted the shop, they said no dice as it was out of guarantee, I then quoted "Trading Standards" & "Not fit for the purpose it was sold".

    The shop then told me to go get a report that says it was not due to me chucking a cup of tea at it (well, it was a report to show that it was a fault with the PCB).

    I sent this report to them and they still tried to weasel out of it because the report did not explicitly say it was a problem at the time of purchase.

    This time, I wrote to head office (recorded delivery etc) telling them with reference to the "Sale of Goods Act 1979 (as amended)" that the TV "is not of satisfactory quality.".

    They sent me a cheque for the full cost of the TV, the report and all postage costs.

    My point is, that although I am sure that Applecare is a great service and offers more than an extended warranty would do, it is NOTa prerequisite for sub standard goods to be repaired or replaced.

    Under the simple "reasonable" rule, how long should an iMac last? My TV lasted 18 months and cost "only" £300. How much did you pay for your iMac and how long did it last, I'm guessing it is less than 2 years old?

    Don't just put your hand in your pocket to get this fixed, Apple still have some responsibility.

    Trading Standards are there to offer impartial advice re this type of thing, take a few minutes to look it up.

    Hope this helps.

    J.
     
  22. DanielCoffey macrumors 65816

    DanielCoffey

    Joined:
    Nov 15, 2010
    Location:
    Edinburgh, UK
    #22
  23. Jamsen thread starter macrumors newbie

    Joined:
    Feb 16, 2010
    #23
    Thank you for your replies and concern.

    I've left it at the Apple Store for testing and diagnosis, so I'll defiantly get a written report with any faults found. You're right I paid about £14XX about 2 years ago. If it is the logic board do you think I will have a case to claim 'no fit for purpose'?

    Thanks again.
     
  24. Muttley1900 macrumors newbie

    Joined:
    Dec 27, 2010
    #24
    Fingers crossed

    My view is that as long as the iMac hasn't been abused then whatever the part is that has failed, you have a case for 'not fit for purpose' and/or 'it is not of satisfactory quality'. The only point is which part has gone wrong so who are you claiming for a repair / replacement from (if it is the hard drive then your issue is with whom you got the hard drive from).

    Best of the luck with the report tomorrow and hopefully Apple will repair without too much of a fight.

    J.
     
  25. Jamsen thread starter macrumors newbie

    Joined:
    Feb 16, 2010
    #25
    I've just heard back from the Apple Store, they are unsure what is wrong but suspect the logic board, cost for replacement will be £550.02 + VAT. I was told that if repair was to go ahead that it will only be single item isolation and that by doing the repair they can diagnose further. I politely told him that I was not happy with the diagnosis and I do not want my machine repaired for this price and that I will go and pick it up in a couple of days.

    I cannot be without my computer for very long, so I will be complaining to Apple re. not fit for purpose, how should I approach this?

    Thank you
     

Share This Page