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. 2 e" h$ t8 T( ^0 X+ FYou know, I mean, you should let the BIOS to recognize the newly installed HDD. 0 C( p8 C0 R' A% q5 mPS: against your description, you mayy MEMORY may meet difficulty. unplug them and reinstall after proper cleaning.