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  1. #1


    Member Since
    Nov 05, 2009
    Posts
    2
    Windows 7 on 27" iMac : Black Screen
    Hello!

    After several enlightening hours spent exploring the forum, I didn't find a solution to my problem, so let's start a new topic explaining my situation :

    I've had a 20" iMac for 2 years with a Dual Boot Mac OS X / Windows XP, and was very happy with it.
    I bought a few days ago the new 27" iMac as I couldn't resist the huge beautiful screen. But I still need Windows for several activities. So I thought about installing Windows 7.
    Being a student, I took advantage of this offer : Microsoft Student - Windows 7 .

    Problem : It doesn't gives an install disk, but only a download of an update that allows to "upgrade" Windows XP or Vista to Windows 7.
    So it seemed to me I had no choice but to install Win XP or Vista with Bootcamp, and then upgrade it to Windows 7.

    I have legal versions of Windows XP, so I installed it on the iMac with Bootcamp. All went fine. Then I downloaded the upgrade, and the upgrade assistant to Windows 7, with no worries. But when I started the Windows 7 install, the following happened : The first steps went fine (Copy of Windows files, Decompression of Windows files, Install of fonctions, Install of updates), but at the last step called End of install, I just had a black screen.

    I let it run for a while, nothing happened. So I rebooted, and after the Windows logo I had a black screen again.

    I cannot start the safe mode with F8 because the install has not been completed. And still with F8, starting in a low resolution doesn't help.

    So at this point I'm a little lost, and would be very grateful of any idea that could help making things advance. Thanks

  2. #2

    Kash's Avatar
    Member Since
    Dec 03, 2006
    Location
    Irvine, CA
    Posts
    9,385
    Specs:
    Black Macbook C2D 2GHz 3GB RAM 250GB HD iPhone 4 iPad 3G
    My brother had the exact same problem with his 27" iMac. After doing a bit of searching, here is the solution to your problem

    One change, in step 6, replace NVLDDMKM.SYS with ATIKMDAG.SYS

    June 2007
    July 2009

  3. #3


    Member Since
    Nov 05, 2009
    Posts
    2
    Thanks! I did some reasearch too, and came across this topic : Apple - Support - Discussions - Black/Blank Screen with Boot Camp Win 7 ... where one person links to the same site you do.

    So now the install went fine, and I've also installed Bootcamp 3.0.

    The only problem now, was that I couldn't go higher than a 1920x1440 resolution.
    As one person in the thread I linked said : "The BootCamp driver that loads only give a max resolution of 1980 X 1440 so everything looks stretched. Installing the ATI drivers from ATI did no good."

    But the next one says "After following your solution and then run the window 7 update, the screen rsolution issue is now resolved. I think Microsoft just released an update sometimes today and the update is reading as following:

    "ATI Technologies Inc driver update for ATI Mobility Radeon HD 4670". "

    And indeed after this update it works perfectly.



    Edit : Also, there was no sound, but Windows found the problem all by itself, downloaded some driver and it worked instantly after that. I have to say this Windows 7 looks very good so far, and it seems it'll be a pleasure to use when I have to leave Mac OS

  4. #4

    chscag's Avatar
    Member Since
    Jan 23, 2008
    Location
    Fort Worth, Texas
    Posts
    48,502
    Specs:
    Late 2013 27" iMac, iPad 3, iPhone 6s+, iPhone 6+, 3 iPods, El Capitan
    Thanks to you and Kash for the great info! I hope other folks will refer to this thread to help resolve the same or similar problems. I've got this thread bookmarked.

    Regards.

  5. #5
    todd51
    Guest
    I'm having the same problem on my new 27" iMac. I have a question for you Ragna, how did you boot from the Win7 disc if you did the download from the upgrade site? Did you just use your XP disc to delete the file? I also downloaded the upgrade so I don't have a Win7 disc to boot from.

  6. #6
    todd51
    Guest
    Woo Hoo! I got it! For anyone else with this issue (I'm sure there will be more people in the near future) I couldn't even boot from the XP disc because I couldn't get past the Administrator Password in the Recovery console. So, I downloaded the free trial of Tuxera so that I could get write access to my Bootcamp partition in OS X. Restarted my iMac and navigated to CWindows\System32\drivers and deleted the ATIKMDAG.SYS file, then removed it from the Trash, rebooted to my Windows partition and now I'm continuing with the Setup!

    Man this was a headache.

  7. #7

    Kash's Avatar
    Member Since
    Dec 03, 2006
    Location
    Irvine, CA
    Posts
    9,385
    Specs:
    Black Macbook C2D 2GHz 3GB RAM 250GB HD iPhone 4 iPad 3G
    Tell me about it, I had to troubleshoot for my brother who lives on the other side of the country so I didn't even have access to the physical machine.

    June 2007
    July 2009

  8. #8


    Member Since
    Nov 19, 2009
    Posts
    1
    Ok, so I got it to work out of the box. Here is what seems to be happening. When the screen goes black, it is the second monitor that becomes active leaving the primary 27" mac screen black. If you continue the installation on the second screen, when it is done it switches back to the Mac 27" as the primary screen.

    I noticed this because I hooked up a secondary screen during the install. After that the rest of the install worked (oh I also hooked up wired keyboard and mouse), including having 2560x1440 resolution.

    After the install was done, the only thing that did not work (although the system says it does work) is sound and bluetooth. After the system did its own update the Bluetooth started working, both the mouse and keyboard, the ATI drive got updated on its own, and then sound started to work all by itself too. The funny thing is the sound that started to work seems to be over the HDMI connector to the second monitor. But at least I did not have issues making me delete any files.

    So you guys, just hook up second monitor on the Display Port, a Mouse and Keyboard, install, do the updates, and it all works perfect.

  9. #9


    Member Since
    Dec 19, 2009
    Posts
    1
    Alright, so what I did to fix this issue is...

    My girlfirends grandpa bought this 27" imac. He wanted Windows 7 through bootcamp to run a few windows based apps. As we all know I ran into the blank screen issue. What did I do? I called Apple, and I had already figured that Windows wasn't able to display on this abnormal (and awesome-ly) large 27" screen, not allowing me to finish setup. So I downloaded VMWare as a trial, set it to open my bootcamp drive, and finish installation of 7 Ultimate. I inserted the OS X 10.6.2 disc, browsed and put the drivers for bootcamp on the Win partition. And now it allows me to use win as regular, by selecting option at start up. Boom Roasted, darn blank screen. Virtualization FTW! It saved my bacon.

  10. #10


    Member Since
    Jan 25, 2010
    Posts
    1
    Thumbs up Step by step fix for Windows 7 Black Screen on boot camp
    Hey there, I found this step by step guide on how to fix the windows 7 black screen on boot camp issue. It is quite easy I think...

  11. #11


    Member Since
    Apr 07, 2007
    Posts
    27
    Quote Originally Posted by CrazyGuy View Post
    Hey there, I found this step by step guide on how to fix the windows 7 black screen on boot camp issue. It is quite easy I think...
    Even easier. Follow this guide. All you need is a USB drive and you're all set. Took me 10s to get it set up and all went smooth first time! MSG me if you have any problems.

  12. #12


    Member Since
    Apr 27, 2010
    Location
    Schaumburg, IL
    Posts
    1
    Specs:
    27" iMac i7, 4GB 1066MHz DDR3 SDRAM, 512 MB Nvidia and 1TB HDD
    Thanks
    I am so glad I found thos forum...thank you gentalmen...hours waisted is an understatement.

  13. #13


    Member Since
    Jan 08, 2011
    Posts
    1
    Unhappy
    hello all - my first question is, how did you unfreeze your iMac - mine is frozen black and holding down the alt key while restarting doesn't help at all. The only thing that does happen is Window sort of opens in safe mode but I can't make it go away or get it to continue. I can't even get the installation cd to eject... Any help would be greatly appreciated!!

  14. #14


    Member Since
    Sep 04, 2011
    Posts
    1
    If you hold down the mouse button when the machine boots, the CD should eject.

    I found a guide Windows 7 boot camp install that details another way of resolving the blank screen problem.

  15. #15


    Member Since
    Nov 19, 2011
    Posts
    1
    Hey everyone hope someone can help me with this. I followed what some people have posted and deleted the ATIKMDAG.SYS file using paragon. I was able to continue the setup and it finished. Then it restarted and now im looking at a black screen with a blinking cursor at the top left corner and if you leave it there it doesn't do anything else. I read on other places that its meant to bring you to a system manager of some sort after 2 minutes but my imac doesn't do anything.
    It's a late 2009 model 27" imac and im installing windows 7 64bit. I tried to open the bootcamp partion through VMware and that opens fine and work but I don't want to run it as a virtual machine. Can anyone share some light please

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