Lite - on dvdrw ldw-851s cd reading problem

my lite on cd - dvd combo burner won’t read my cd’s! although it reads dvd media. i have this burner for about a year now, and have expirenced simmilar problems before, but they resolved by itself (!!!). burner is conected with the hard - drive with the same ide cable, couse my second ide slot on the motherboard is busted. i’m a total newbie, and i don’t know what the problem is… any help is appreciated!