Black screen after installing Boot camp Win7 on iMac 27 late 2009

I've run out of ideas as to how to fix this problem. I have a late 2009 iMac quad i5, Mountain Lion, 12GB RAM, 1TB HD (recently exchanged under extended warranty).
I stopped counting how many times I have tried to get this up and running but I followed a whole bunch of 'how to's' on the net, including the official Appple guide, but I always end up with a black screen. I insytalled it from scratch using both, Apple drivers on CD and SD card and I can confirn that they installed correctly during my last try. That time I first installed Win Vista, then upgraded to Win 7. I took out the install DVD after first restart and left the SD card in its slot (correctly named, as suggested by Apple). the installation finished, the screen went dark for about 5 min, then the computer rebooted, the screen went dark again for another few min and after that the vomputer restarted again but this time all stayed dark and nothing happened for the better part of an hour.
I also restarted from the Win install disk and tried to remove the ATI drivers using command lines, as suggested in one post.
I need to run Win in Bootcamp because some application I use are very demanding so I need Win to run natively. In an earlier attempt I managed to boot Win7 from the Bootcamp partition in Parallels and I installed the Apple Drivers in that environment but it still resulted in a black screen. I also tried to remove the ATI drivers from Drivers directory manually in MacOS mode but the System wouldn't let me edit the Syustem folder at all, not even in Root user mode.
I understand that I'm not the only one with problem and I feel for you, but please refrain from "me too" posts becuase it doesn't really solve my problem. Thank you.

I presume that you've followed the instructions for sideloading the iMac Windows drivers into your install via USB stick? (wasn't aware the EFI recognized the SD slot as storage on boot. Now i know)
I always found more success in just slipstreaming the drivers and install.xml file onto a custom Win7 DVD rather than the USB approach when trying with my Late 2009 27" iMac. The Win7 installer needs that enclosed .xml file in the driver package to tell it where to find the drivers so that they be loaded when the Win7 image extracts itself.
If you're using mountain lion, then you should be receiving the proper Win7 driver set. If you wanted to create a custom image, then you can use an ISO file, the driver package and disk utility to make something you can use. Either that or you learn what edits your install.xml file needs to point the installer properly and check it manually.
I don't know what links you have so i'll just include everything:
Installing boot camp on a Late 2009 iMac:
http://support.apple.com/kb/TS3173
Direct link to Late 2009 iMac-specific Windows drivers.
http://support.apple.com/kb/DL995
I'd try a USB stick and the iMac-specific driver set. It should steer your insolent windows installer correctly.
Hope this helps.

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