Compaq Deskpro 2000 Series Reference Manual page 73

Opening the CD-ROM Tray
3. Close the tray by again pressing the eject button
The drive performs a diagnostic check and automatically
begins reading the table of contents (TOC). The busy
indicator turns amber while the drive reads the TOC.
The tray automatically opens if the disc is upside down, not
properly nested in the tray, or if any other condition prevents the
drive from reading the disc.
4. When the busy indicator turns green, the drive is ready to
receive commands and data may be retrieved from the disc.
Ensure plenty of clearance for the tray to open and close.
.
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Reference Guide 4 -3