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. 6 U J/ d+ r- t3 }4 DYou know, I mean, you should let the BIOS to recognize the newly installed HDD., O+ u$ A6 J0 A5 X/ S6 o; y
PS: against your description, you mayy MEMORY may meet difficulty. unplug them and reinstall after proper cleaning.