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  1. #1

    Member Since
    Sep 12, 2010
    Imac 27" problem with windows!
    I have Mac OS X Version 10.6.4:

    Model Name: iMac
    Model Identifier: iMac11,1
    Processor Name: Intel Core i5
    Processor Speed: 2.66 GHz
    Number Of Processors: 1
    Total Number Of Cores: 4
    L2 Cache (per core): 256 KB
    L3 Cache: 8 MB
    Memory: 4 GB
    Chipset Model: ATI Radeon HD 4850
    Type: GPU
    Bus: PCIe
    PCIe Lane Width: x16
    VRAM (Total): 512 MB
    Vendor: ATI (0x1002)
    Device ID: 0x944a
    Revision ID: 0x0000
    ROM Revision: 113-B9110C-425
    EFI Driver Version: 01.00.383
    Resolution: 2560 x 1440
    Pixel Depth: 32-Bit Color (ARGB8888)
    Main Display: Yes
    Mirror: Off
    Online: Yes
    Built-In: Yes
    Connection Type: DisplayPort
    Display Connector:
    Status: No Display Connected

    I installed windows 7 with bootcamp successfully, installed the drivers from the "Mac OS X Install DVD" but i get freeze screens/black screens and a message, "display driver is not responding and has stopped working" when it works again. This happens very often maybe every 5 minutes, sometimes it never recovers from the freeze/black screen and i have to restart from the power button. When he's in a good mood he gives me a blue screen for a change and restarts.
    Also i cant access my hard drives because i cant operate as the administrator and it doesn't ask me for a password or something. How do i log in as admin?

  2. #2

    chscag's Avatar
    Member Since
    Jan 23, 2008
    Keller, Texas
    2017 27" iMac, 10.5" iPad Pro, iPhone 6s+, iPhone 7+, Numerous iPods, High Sierra
    Moved to correct forum.

    You need to go to the ATI site and download the mobility drivers for your 4850 GPU. The iMac is actually a notebook computer built vertically as an all in one machine. The correct drivers will install OK and should eliminate the freezing and black screens.

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