I tried four different keyboards and they all work on different PC's. I have an Alienware Aurora R8 and its less than a month old. I restarted the pc in safe mode and I can capitalize the letter z in safe mode, so the problem is some software on my computer has shift+z bound to it for some reason and its not letting me capitalize the letter. I cannot find any program with shift+z bound to it, its driving me crazy. Possibly some of the alienware software that comes pre-loaded on the pc? Any help would be appreciated!