Sony VGN-TX1HP/W User Manual page 35

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Using Your VAIO Computer
4 Close the tray by pushing it in gently.
!
Do not remove the optical disc when the computer is in a power saving mode (Standby or Hibernate). Doing so may cause the computer to malfunction.
If you plan to use an external optical disc drive, connect the drive before you launch any preinstalled CD/DVD program.
See the printed Troubleshooting Guide if you have problems using discs.