Can I use 27'' Cinema Display on Windows machine with MiniDP input?

Yes you can use it. I assume you already have the monitor. The new display annouced yesterday would not work fyi.

You are not going to be able to adjust the brightness. If this is a problem then you'll have to find a mac with a mini display port and change the brightness that way.

 

Er... that's not true, Battlefield Fan. The OP can absolutely change the brightness on a pure Windows machine. OP, the mDP version of the Apple LED Cinema Displays 27" is 100% compatible with PCs running AMD Radeon 6xxx cards (or any nVidia GeForce cards with DisplayPort). Brightness can be adjusted from 0-100% by running AppleControlPanel.exe which I have provided a link for below. I extracted the file from the official Apple BootCamp package. The only possible quirk is that if your PC's BIOS is set to AHCI mode instead of IDE, you need a bootable disc in your DVD (such as a Windows 7 disc) to allow the exe file to launch. Otherwise, there are zero issues with controlling brightness on a PC.

Here is a link to both X64 and X86 AppleControlPanel.exe
http://hotfile.com/dl/108814331/7d31ce2/APCl.rar.html