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. % p3 W& m- k* D, T% a9 w; dYou know, I mean, you should let the BIOS to recognize the newly installed HDD.+ C9 Z6 |! N y) K2 l
PS: against your description, you mayy MEMORY may meet difficulty. unplug them and reinstall after proper cleaning.