HP Compaq Presario,Presario 800AP Supplementary Manual page 57

If you need to eject a disc when the power is off, complete the
following steps to eject the disc manually:
1. Make sure the power is off and any external power sources
are disconnected.
2. Insert a small rod or pin, such as a paper clip (approximately
1/16 inch in diameter and at least 3/8 inch in length) into
the Manual Eject Hole and push firmly as shown in the
figure above.
3. Remove the disc from the tray.
4. Gently push the tray back into the drive until it locks
into place.