It can be alot of things. Do you have EZ drummer loaded , can you see the screen but cannot hear the drum sounds? I am currently using X2 64bit on a windows 7pro operating system, if your the same follow me, even if your not, you can reference my paths on your system Im sure! Make sure you installing the proper bit for your Operating System IE, 32bit or 64bit, this is a common problem. Also, make sure the .DLL files are where they should be, here is my path on my pc, C:program filesCakewalkVstpluginstoontrack64bit – in this folder you should have all your toontrack .DLL files! Now, pay attention, in your C:program files (x86)toontrack folder you should have a folder for EZdrummer and in that folder any addons for the kit should have their own folders, IE, EZX_MetalMachine and so on, along with these following folders, HelpMenu, Midi, Sounds. Make sure these folders and Files are there. Also in your C:Program Files (x86) CakewalkVst plugins folder should be copies of all of the toontrack .DLL files. Again make sure you using the proper bit either 32bit or 64bit. Now if these files are in their folders as they should be, make sure the path is set in X2 like this!
Open X2 and then under the UTILITIES tab, select Cake walk plug-in manager. In the VST Configuration box, select SCAN FOR PLUGINS.
After its done scanning, go to the Plug-in Categories box to the left, select VST INSTRUMENTS (VSTi) and check to see if EZ drummer is listed there.
If it is not then X2 cannot find your .DLL files. DO THIS-> go to the VST configuration box again, select OPTIONS and manually ADD the folder path to the .DLL files, make sure to add both your progem files path and program files (x86) path, and then rescan! Sometimes you have to add the file path in X2, because its stupid, but your smart, I hope this helps, if it doesnt, Im willing to speak with you over the phone to get you where you need to be. Send me an email at bigjguitar@gmail.com and Ill get with you bro, no one shoud be without the sounds of EZ drummer!