Previous 1 2 3 4 Next 45 Replies Latest reply: Nov 27, 2012 12:01 PM by Eric Root Go to original post
  • Ovilnie Level 1 Level 1

    After multiple tests I found a way to not display the black screen on start: turning off my bluethooth devices (magic mouse and keyboard) after the Mac stop and only turn them on  after the apple screen appears the second time during start or when the desktop appears.

    This works for me!!!!

  • Ray McClain Level 1 Level 1

    Thank you very much Ovilnie. I had the same problem as most of the others in this thread and tried many solutions. I reset the Pram (no effect), I reinstalled the Mountain lion (no change), I erased the hard drive, repaired the hard drive also with no change. I did two things that worked for me. The first was to check System preferences- Users and Groups- Current User- Login Items. I found two things in there that were  startup items that I no longer used and removed them. One was from an application that I had removed from the application folder, and the other was to mute the sound (volume) of the startup chimes. The second thing I did was to wait until the home screen was loaded after start up before I turned on the bluetooth mouse and bluetooth keyboard. This worked perfectly. I did not follow my own advice from experience and changed two things at once before I checked to see if the problem was solved. Therefore; I am not sure which worked (or maybe both were needed).

    Try the delay on bluetooth devices first - that is the easier of the two. I spent several hours trying to fix this and all I really need  was to read Ovilnie's post and follow his lead. Thanks again.

  • Ray McClain Level 1 Level 1

    It seems to be the bluetooth devices that cause the problem. When I start and turn on bluetooth mouse and keyboard before the homescreen posts, I get the DOS screen and have to type "exit". Ovilnie was spot on for my Imac 24" early 2008 with Mountain Lion.

  • Csound1 Level 8 Level 8

    Gnarlodious wrote:


    That is a system crash called a "Kernel Panic", search Google for the awful truth. It usually means something is horribly wrong with either your hardware or installation. If it ran normally under 10.7, I suggest re-installing 10.8 on a clean wiped hard disk which should fix the problem. You may be able to boot up into recovery Disk mode to fix problems, search internet for more info.

    This is not a kernel panic, try not to alarm the OP.

  • Tjaka Level 1 Level 1

    Hey guys,


    The new update MAC OS X 10.8.2 (12C54) seems to have solved the problem for me. Also with bluetooth keybord and mouse on before startup.


    Many thanks to Apple for solving this issue!

  • Ovilnie Level 1 Level 1

    Not for me.

    The problem persists.



  • Tjaka Level 1 Level 1

    Hai Ovilnie,


    Strange? I have had this problem everytime I started up until this new update.


    Maybe it has something to do with the hardware.


    I have the following MacBook Pro:


    15-inch, medio 2009

    Processor  3,06 GHz Intel Core 2 Duo

    Geheugen  8 GB 1067 MHz DDR3

    Videokaart  NVIDIA GeForce 9400M 256 MB

    Software  OS X 10.8.2 (12C54)


    I hope for you others who still have this black screen on startup, will reply to this topic so Apple knows about this problem for a future update.

  • Tjaka Level 1 Level 1

    Hmm... Too bad! After one week same problem again...


    I thought it was solved for me but unfortunately it did not...

  • B9I Level 1 Level 1

    After "The OS X v10.8.2 Supplemental Update" the problem is still there for me, but your work-around is still working to !

  • alexcaplin Level 1 Level 1

    The black screen disapeared for at least a month ! I downloaded an update a couple of days ago and it's back again !!!! Come on guys you need to fix this problem !

  • Weregus Level 1 Level 1

    Helo everybody,


    I have and iMac and I have the same issue as all of you, so I have made the following. Thinking of a problem in my HD I have formated the system writing 0 on the surface and I have made a clean install of the last version of Mountain Lion, and the problem appears from the very first start and it seems to be random because sometimes works with the bluetooth devices on, sometimes no... and I have just only the Mac and the mouse and keyboard, no USB HD and no other device connected to it.


    I am really dissapointed because is the third time I have formated my Mac thinking I have a bad program just to know now that it is a OS problem. I even thought in the problem reported latelly about the iMac HD problem and the replacement program, but my iMac was not included. My Mac configuration is:



    24-inch, Early 2009

    Processor  3.06 GHz Intel Core 2 Duo

    Memory  8 GB 1067 MHz DDR3

    Graphics  ATI Radeon HD 4850 512 MB

    Software  OS X 10.8.2 (12C60)


    Please Apple, help us!



  • seamuswarren Level 1 Level 1

    The issue remains unresolved.


    A way around it is to wait until your computer is nearly booted up before turning on the wireless keyboard and mouse.


    This "work-around" made me less motivated to continue the support I was getting from Apple and I think my three months of support will have expired by now.


    Support got me to run an Apple hardware diagnostic program that is found on one of the original system discs. The diagnostic indicated there are no hardware issues.


    Apple needed to rule out any hardware issues which would have conveniently left me high 'n' dry as my hardware is out of warranty. :)

  • Weregus Level 1 Level 1

    I have just tryed it, and it seems to work for me, but for how long? I'm sure Apple is not going to change our old iMac for new ones even if the new ones don't suffer from BWD (black window disease), but how long it is going to take Apple untill they find a cure and launch and update??


    I hope they think a three years old computer still worth a try 


    I have seen that this is an old issue and that Apple has not talked about it officially yet so I'm really worry about their silence when they are the first admiting their errors and fixing them.


    Everyday I am more convinced that the problem is with the Bluetooth because I have a LEGO Mindstorm and when I updated to Mountain Lion, the Bluetooth connection with my NXT brick stopped working, so something has changed in the Bluetooth system software that has broken our old Macs.

  • seamuswarren Level 1 Level 1

    I think it's a hardware compatibility issue. There were no start-up issues with OS X Lion on my 2009 iMac.


    Things changed when Mountain Lion was installed. It's disappointing. Apple seem to be losing some of their "Mojo".

  • Weregus Level 1 Level 1

    Yea! this is more like a Microsoft problem... I still remember the firs time I installed Windows Vista in my new and shiny PC a few years ago, with the last hardware parts, bought less than one week ago, and suddenly everything was incompatible


    Was like, what kind of joke is this Mr. Gates!!! This was the exact moment when I switched to Mac. Apple can't afford hardware-software compatibility problems because user buy Apple product because of this, the perfect HS integration. If this fail, then there is no different between a Mac and a PC apart from the price difference. To have HS problems I can buy a 600 bucks PC instead a 2600 bucks Mac and return to Windows


    Please Apple, hear our prayers and fix the Bluetooth compatibility in old iMacs (or whatever the problem it is).