See if there is a paperclip diameter size hole to the lower right or left of the optical drive slot. If so this is an eject hole, use paper clip in the hole to eject.
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That failing, shut it down and restart holding down the mouse.
See if there is a paperclip diameter size hole to the lower right or left of the optical drive slot. If so this is an eject hole, use paper clip in the hole to eject.