Hi I have just got my new iMac. 2.4 GHz, 2GB RAM, ATI Radeon HD 2400 XT. I have installed the Parallels trial and installed the Windows 7 beta, all went well, quickly and smoothly. However I'll open up things in Windows and the Coherence button is always faded out, so I can't use it. How come? I haven't installed nay drivers or anything. Are they needed? What have I missed? Any help appreciated, thanks.