Default [Q] No touch response help!

hey guys, i recently bought a gs3 lcd + digitizer on ebay, and when i got it, i installed it right away. After installing it, i turned on the phone the digitizer displayed the boot up, but i noticed that it the boot took wayyy longer than before and after it booted it displayed the lock screen, but then my problem is that the touch doesnt work, the back button works but no touch response at all. help???