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 <==(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 <==(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.
Best Answer
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 & 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?
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
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.