I know for a fact that the harddrive works because I tested it in a different laptop and it boots Windows XP fine. When the harddrive is in my compaq presario v2000, i get a BSOD 7B error code and the system reboots immediately. Through use of AVAST BART cd i was able to check the harddrive and it is being detected and free of errors. I have tried moving the harddrive jumpers, but nothing seems to work. Am I having mobo problems or do I not have the correct harddrive drivers? Any help would be appreciated. Thanks