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. # `4 q- H; Y) f' R6 A/ A: [You know, I mean, you should let the BIOS to recognize the newly installed HDD. : V3 t Z; t/ G2 A7 N$ qPS: against your description, you mayy MEMORY may meet difficulty. unplug them and reinstall after proper cleaning.