Black screen in Windows 8.1 on Late 2009 27" iMac

Hi,
My Late 2009 27" iMac i7 will not allow the display to turn on under Windows 8.1. It's not just black, its as though its powered off. This is some kind of a software problem. I am certain of this because I ran Windows 8.1 just fine since its release (10/17/2013). Hoestly, I ran it for months without a problem. I think it was an upgrade install over Windows 8 and not a clean install. Anyways, last week I upgraded to an SSD and needed to re-install Win 8.1. Now the display won't turn on. It works fine when you first boot it up after the setup runs, then a windows chime sounds and the screen goes blank and never turns on again. If you enable RDP before this happens you can still access the computer. I have re-installed Windows 8.1 and also I have tried BootCamp 4.0.4033, 5.0.5033, and 5.1.5621. None of them have enabled the display. Nor has the vanilla driver from AMD/ATI. I am at a complete loss as to what to do. My only hope is there are a handful of other users with this model of iMac who also have this issue and have solved it. If I ever find the solution you can count on me writing it in detail here in this thread or linking to a thread that solves it.
Thanks,
sr.matto

Summary: The ATI Mobility Radeon HD 4850 and other "legacy" graphics cards are not yet supported by AMD/ATI on Windows 8.1.
If you are disatisfied with a perfectly serviceable series of video cards being dropped from support make yourself heard: http://emailcustomercare.amd.com
---Details---
Okay after some pretty exaustive research I have found out a few things.
First, that AMD/ATI has decided to not include several series of "legacy" video cards in their support for Windows 8.1. This support may come in the future. There are conflicting reports about wether or not this is happening.
Second, there is a small community that is devoted to unofficial modified drivers that are supposed to allow legacy cards to be used on Windows 8.1. -> http://forums.guru3d.com/showthread.php?t=372799. I had no success whatsoever with these drivers, even on a clean install of Windows 8.1. I did get the drivers to install, but no games could start and Windows warned me about the drivers being unsigned frequently. So I would be hesitant to devote a lot of time to installing those drivers.
Lastly, I am pretty disapointed with AMD/ATI. Sure, the card is approaching its sixth year anniversary (~June 25, 2008) but it works just fine for most uses. It is a perfectly serviceable card for desktop uses. I just installed an SSD with the hopes of getting four more years out of this computer. I guess I will be religated to Windows7/8 on this machine till the end of its life. People considering the SSD upgrade may want to take this into consideration. I suppose its a non-issue if you are OK with using Windows 7 for four more years.
There seems to be a potential for upgrading the video card to the part used in the 2011 iMac, but for now that part costs $500 or $600, if its even stocked.
Message was edited by: sr.matto (spelling)

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