Connect a Thunderbolt Display to windows 8 desktop I've been spinning around with this question but couldn't find the answer. Hope someone here could help. 

I have been trying to connect my Windows 8 desktop to a Thunderbolt Display 27" without success. My desktop only has HDMI and VGA output. Hence, I naturally tried two options: 

1, Desktop &lt;==(VGA)=adapter=(Thunderbolt)==> Display 

Result: Thunderbolt screen remains blank/black/not turned on when I plug it in. Also tried to restart the desktop while the two are connected, no luck!

2, Desktop &lt;==(HDMI)=adapter=(Thunderbolt) ==> Display

Results: Exactly the same as above. 

Any suggestion folks? 

P/S:I've paid $2K for two of my Thunderbolt displays thus don't want to throw them away.
Thunderbolt is not backwardly-compatible with any other display technology. It is an active technology, all before it were passive. It is a combination of video &amp; PCIe.

You can connect Thunderbolt to DisplayPort, but not the other way round.

From how do I connect an Apple Thunderbolt display to a PC?


  If the Wikipedia article is to be believed (and I do believe it is correct based on what thunderbolt is), then your configuration will not work.
  
  Compatability
  
  Apple Thunderbolt Displays, like the video input on Thunderbolt iMacs,
  drop compatibility with all previous standards, including VGA, DVI,
  and DisplayPort.[3] As such, they cannot be connected to computers
  lacking a Thunderbolt port, including pre-2011 Macs and the vast
  majority of PCs.


Thunderbolt is not the same as Display Port.  Therefore you can only connect thunderbolt equipped Mac's (or some PC's with thunderbolt hardware and appropriate drivers) to the Thunderbolt display.

From the Apple Mini DisplayPort FAQ


  
  My computer has the same connector but the symbol is different, what does that mean?
  
  
  Some Apple computer have a Thunderbolt port instead of a Mini
  DisplayPort. Computers with a Thunderbolt port will have the following
  symbol next a port although the port physically appears the same as a
  Mini DisplayPort:
  
  Thunderbolt ports:
  
  Are compatible with all of the Mini DisplayPort adapters referenced
  below in question 5 and with Apple Mini DisplayPort equipped displays.
  Support adapters like Apple's Thunderbolt to Gigabit Ethernet Adapter
  and Thunderbolt to FireWire Adapter which are not otherwise compatible
  with Mini DisplayPorts. See Thunderbolt ports and displays: Frequently
  asked questions (FAQ) for more information on Thunderbolt.


So with your adaptor you can drive a DisplayPort based monitor to your PC, but not a thunderbolt display as it lacks support for DisplayPort.  That's why it didn't turn on and work.

Some Googling and I haven't yet been able to find a USB based thunderbolt adaptor, it seems there is talk of such a device using USB 3.0 to thunderbolt although at reduced speeds.  There are a few thunderbolt PCIe cards available and some PC motherboards support thunderbolt.