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. & W* X/ u7 \3 c: @6 u R9 M: wYou know, I mean, you should let the BIOS to recognize the newly installed HDD. 0 P+ x/ `" O; zPS: against your description, you mayy MEMORY may meet difficulty. unplug them and reinstall after proper cleaning.