Compaq DESKPRO 2000 SERIES Maintenance & Service Manual page 216

If you need to manually eject a CD from the CD-ROM drive, insert a metal rod that is approximately
1.2 mm in diameter and at least 35 mm in length (1/16 x 1 3/8 inches) into the manual eject hole and
push firmly. A straightened paper clip works well. The tray will come out 1/4 to 1/2 inch. Pull the tray
out by hand until the CD can be removed.
Figure 5-92. Manually Ejecting a Compact Disc
Compaq Deskpro 2000 5-103