Imac 27" 5K late 2015 black screen on startup

Discussion in 'Mac Basics and Help' started by Kelly89, Feb 27, 2016.

  1. Kelly89 macrumors newbie

    Feb 27, 2016
    The Netherlands
    hi all.

    I've bought a new iMac 27" 5K late 2015 (bought it early december) and it has been fine all the time but suddenly a week or 3 ago he started to get problems.
    Finder is crashing often, preview had crashed so bad that the whole iMac crashed and needed to shut down with the power button. Usb thumbdrive that crashes all the time (dont use it anymore)

    And now i've had the iMac startup with a black screen with cursor in the left corner 4 times in a week.
    I need to shut it off with the powerbutton and start in safe boot because otherwise it just starts up again with the black screen.

    Im gonna call apple monday but i'm not sure what they would advise.
    I already did de diagnostic test (the one you do when he is starting while holding a button) and nothing was wrong.
    Safe boot works as supposed and i've not updated any ram or other hardware.
  2. chscag macrumors 68030


    Feb 17, 2008
    Fort Worth, Texas
    If there is an Apple Store near your home, make an appointment and take it on in for them to run diagnostics on it. A 27" iMac is a heavy machine to carry to the Apple Store, but that's usually the best way to get problems like you're having resolved.
  3. Kelly89 thread starter macrumors newbie

    Feb 27, 2016
    The Netherlands
    Thanks for answering.
    I do have an original Apple store "nearby" and the reseller where i bought the iMac.
    So that is step 2 for me.

    Gonna call apple (still have a few days of free applecare) and see what they think. Because i need to use public transport to get to the stores and that kind of is a big hassle with such a big box with that value inside haha.

    But in the end i might need to get back to the store.
    I just don't know how i got these problems and that is something i hate. Rather try to fix it myself like i always do.
  4. Kfalken macrumors newbie

    Mar 21, 2014
    I had similar issue, but mine started differently. I also have late 2015 iMac 27", i7, 16G, 395 vid card. After a month of use I turned it on and noticed a vertical line in middle of screen. Did all the tests, reinstalled OS. Fixed nothing. Called Apple and they setup a display replacement at my local Apple Store. They did determine the display was bad. Picked it up and used for a week and one morning turned it on and screen was black. Did hard reset, "hold power button and turned computer off". Rebooted up fine with the msg of the loss of power and to continue. Computer worked great for another week then it happened again. Power off and back on computer again worked ok. A few days later did a restart and it came up with black screen. Called Applel and setup another appointment for the Apple Store. Turned out it was a bad replacement display. Computer has been running fine now for the last couple months.
    I am not trusting it now. I found that Apple is using an LG display assembly after requesting to look at both the displays they replaced. Not the best display. LG TVs have the same issues. Not a good reliability reputation.
  5. Galapaguillo macrumors newbie


    May 6, 2016

    First, sorry for my English. I am from Spain and my English is not one of my virtues. If you don´t understand anything (I wish any), ask me, no problem.

    I bought an iMac 5K late 2015 (1Tb FD and R9 M390 version) on December. A few days later started the problem with the black screen. When I started it up on cold, the screen kept black (black but turns on) and you only saw the cursor in the corner. You can move it, but only it.

    I had the problem with the sleep mode too. They are 2 different problems I think (perhaps with any relation), because when I returned from the sleep mode the screen kept black too, but in this case turns off.

    I called Apple care, I did eeeeeeverything that they said (reinstall Osx, reset PRAM, SMC, etc.) Nothing of them resolved the problems. Finally I carried my iMac to the official technical service. They did every Apple hard test with no results, they changed my screen and my motherboard, but the problems persisted. They came to my house to see how it was installed at home, perhaps searching any fault, but I don´t have any strange thing and no extra and no devices incorporated. They saw everything was OK and they said me that they couldn´t do anything more for my computer.

    I started a fight with the retailer to return my money and after months I got it.

    With my money, I bought another this week, thinking it could be a bad product and I had bad luck. I received it on Wednesday, and today, the problem has appeared again. I am desperate with this. It cannot be bad luck, and probably it is a manufacturing defect of Apple or an OSX bug.

    There is no info about this in spanish forums, no info in spanish, the only info I could find about it was in this forum, so please, have any of yours resolve this problem definitively? Is an OSX problem? I don´t know what to do, if I should keep the iMac and wait for an OSX update or return it to the Apple store. I love this iMac because its screen is amazing and I wouldn´t like to return it if the problem has any real solution.

    Thank you very much!!
  6. ggibson913 macrumors 6502a


    Sep 11, 2006
    If your Apple Care is running out, you are defintely better off taking it into the Apple Store, you don't want to get stuck if it runs out.

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