Last Night My Cd Rom Died And I Got A Used Hp Ltn-486s From The Computer Shop, Note That My Pc Is Not Hp Not Sure What It Is I Was Used So I Install The Cd Rom Drive And Now When I Try To Start The Computer It Say I Don't Have A Primary Master Or Primary Slave And That Ntldr Is Missing Press Ctrl+alt+del To Restart, But That Dos Nothing. Yet If I Unplug The Interface Ribbon The Computer Will Start And The Only Thing It Says Is Missing Is The Primary Slave. What Causes This And How Do I Fix It Thanks For Any Help