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 g! j5 o2 Y* g, t. m) G2 l* M% ZYou know, I mean, you should let the BIOS to recognize the newly installed HDD." L9 a1 o- f8 Z0 I' H+ f
PS: against your description, you mayy MEMORY may meet difficulty. unplug them and reinstall after proper cleaning.