Imac 27" windows problem!

[eyecon3]

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
Displays:
iMac:
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?

 

[Winni]

How do i log in as admin?

Exactly as you do it in OS X: You don't.

Try switching off the User Access Control, you'll find it in the user manager. A reboot will be required. After that, Windows will always grant you administrator privileges when required (unless, of course, your user account is restricted - but then you have configured it like that yourself).

I've seen a similar problem like yours on a Dell notebook a while ago. After installing a different nVidia graphics driver, the problem disappeared. Maybe you want to go to the ATI website and download the latest drivers from there and install them -- Apple's Boot Camp drivers are always rather old and crappy.

Since you don't mention what the blue screen reports as a crash cause, it's difficult to give better advice. Maybe you have another driver for another piece of hardware installed on your machine that is in conflict with the graphics driver. Maybe you have a problem with your system memory (Windows is VERY picky here - more picky than OS X or Linux). Maybe it's just a corrupted Windows installation and a re-install of the system from scratch would be your best shot. I don't know your machine so I honestly can't tell.

Just try an ATI driver from ATI's website first.

If it doesn't help, turn off "auto-reboot after system crash" (or however they call it in Control Panel/System/Advanced Settings) so that you will actually see the blue screen messages and have to reboot manually. When you run in another blue screen, write it down and post it here or google for more hints.

 

[eyecon3]

The blue screen i get is a crass screen but i don't remember what it writes, i have downloaded the ATI drivers :

http://support.amd.com/us/gpudownlo...us&rev=10.9&ostype=Windows 7 - 32-Bit Edition

ATI Catalyst Display drivers but have the same problems.
I get blue green dots on my screen and the freezes .

"Maybe you have another driver for another piece of hardware installed on your machine that is in conflict with the graphics driver."
How can i delete all the drivers from windows to see if thats the case?

 

[scienide09]

First, please don't double-post. It's bad forum etiquette and frowned upon around here.
https://forums.macrumors.com/threads/1024039/

Next, tell us, did you follow the suggestion you got in this thread: https://forums.macrumors.com/threads/1023875/.
If you did, I'm not surprised to hear you're having trouble. By entering the that command at the prompt, you've deleted ALL of your ATI drivers. This is a sledgehammer solution, that may be effective, but has now caused you a series of new troubles. There are other, more delicate workarounds to the problem you saw. Moving on...

OK. Which version of Windows 7 are you using, 32bit or 64bit? And are you downloading the ATI Catalyst drivers for that version of Windows? The ATI download URL you gave points to drivers that support the 32-bit

Next, the ATI URL you pointed to seems to be directing to drivers that support a dufferent kind of GPU.
If you're using Win7 32bit, try these: http://sites.amd.com/us/game/downloads/Pages/radeon-win7-32.aspx
For Win7 64bit: http://sites.amd.com/us/game/downloads/Pages/radeon-win7-64.aspx

Also, does Windows load for long enough that you can run Windows Update? If so, it will find the right drivers for you.

 

[eyecon3]

Sorry about the double posting but i didn't find out how to delete my old post so i made this with more details.


Next, tell us, did you follow the suggestion you got in this thread: https://forums.macrumors.com/threads/1023875/.

Yes i did that.
Have windows 7 32bit and i have installed also the drivers you linked:
If you're using Win7 32bit, try these: http://sites.amd.com/us/game/downloa...n-win7-32.aspx

but still got the same problems

and yes windows load long enough to download updates.

 

[scienide09]

If Win7 will boot for enough time that you're able to run Windows Update, I'd suggest doing that. It should find your ATI drivers as one of the optional/suggested installs.

IF you're still getting the error, chances are your sledgehammer solution deleted more than you wanted. In that case, Winni's above suggestion that the Win7 install may corrupted is a good bet, and you may want to try reinstalling Windows from the beginning. Don't forget this: http://support.apple.com/kb/TS3173

From the AMD/ATI site, are you downloading the drivers, or the full Catalst suite? Make sure it's the latter.

 

[TMRaven]

You should try downloading the ATI Catalyst Mobility Drivers instead. The 4850 in your iMac is mobility, and not desktop. I believe 10.9 is for desktop only.

 

[eyecon3]

TMRaven can you give me a link for ATI Catalyst Mobility Drivers please? I cant find them.
windows 7 32 bit

 

[TMRaven]

http://support.amd.com/us/gpudownload/windows/Pages/radeonmob_win7-32.aspx

 

[eyecon3]

Installed those and they seem to work just fine the only problem now is that i have no sound. Windows dont report any problems with sound but i cant get to hear anything. The drivers from the mac osx install dvd dont work.