I had formatted my system recently and installed XP back from scratch. I am also adding a new hard drive in my system. On boot I found that the drive is not detected. So I tried to enter the bios. But the keyboard did not worked. First the light of num lock blinks and then it simply turn offs automatically. Even after pressing the del key a number of time the system just boot in XP. I am not able to enter bios. I changed the usb port also of my keyboard but still it did not worked.