Sony VGN-U750P VAIO Read This First Manual page 62

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Using your VAIO computer
The disc tray ejects even when it has been locked into place
❑ Ensure that the disc is placed with the label side facing up.
❑ Clean the disc and the disc drive lens with an appropriate cleaner.
❑ The disc may be scratched. Place another disc to see if that is the reason.
❑ There may be condensation in the drive. Remove the disc and leave the drive open for approximately one hour. Remove the
battery while you wait for the condensation to disappear.