Why does the open/close button not work

Why does the open/close button not work

I have disconnected both the audio and HDMI cable from my device.

ANSWERS:

"@igreid wonder if it is in demo mode. While the player is turned on, press  ■ (stop) , RETURN, (pause), and then the SUBTITLE  button on the remote to disable it.

You can also try to open the case by inserting a paperclip in the hole of the drive"