So I bought some A4Tech PS/2 keyboard some time back, and when I try to use it, it wont work... If I plug it in and start the computer, the caps, scroll, and num lock flashes 3 times.. But after that it wont respond. So am I doing something wrong? I didnt get any installation disc or anything, it said on the box you only had to plug it in and then its ready to use. Anyone has any idea? Thanks.