press "Delete" when the system starts up to enter BIOS.(The mathod might be various depends on brand of your system, your user manual may help you) Then find a option such as "IDE Detection" or the like. 9 h" U" D7 ~2 cYou know, I mean, you should let the BIOS to recognize the newly installed HDD. " s9 a# _! x, i5 o) S3 q9 dPS: against your description, you mayy MEMORY may meet difficulty. unplug them and reinstall after proper cleaning.