In article ,
JazzyJeff wrote:
It's the DVD ROM drive on an HP a250. Pressing the eject button causes
the drive activity LED to flash for a few seconds but the tray does
not eject. Heard about most drives of this type having an emergency
release in the form of a pinhole but this drive doesn't seem to have
one. This appears to be one of LiteOn's DVD ROM drives.

Try ejecting electronically using something like NirCMD.

http://www.nirsoft.net/utils/nircmd.html