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.; U* J! o5 G8 f- V
You know, I mean, you should let the BIOS to recognize the newly installed HDD. ; `0 ]4 }% Q% ?) O) W$ N# ?PS: against your description, you mayy MEMORY may meet difficulty. unplug them and reinstall after proper cleaning.