Audio Probs, importing audio Options

[toneytone]

Hallo -just set up home studio using IMAC G4 ..My recording platform is LOGIC EXPRESS, Im trying to using some audio samples from music cds .
When ever i import the audio off the cd into the Logic as an audio track it only stays there as part of a sequence only as long as the cd frm which i took the sample is still in the computer .When i try to retieve the song at a later date it says whilst program is loading "audio not found " and subsequently i cant play back the audio in my song as i sampled it-Can anyone pleeese help, I am new to this...Thanks T java script:emoticon(':crazy:')