Cd or dvds trays wont open use paper clip can hear a response green lite appear but wont open

In this case there is something physically blocking it .probably if you press teh eject button and force it out in the same time with some kinda tool ..it will give up and open ..but will do the same ..when you close it ..So you have to take it out from the case and see if it opens once loose..if it does it means it was forced in the place and most of them does that when they are pressed in ..The only other cause may be a loose belt ..If you think there is no other way ..try to open it and see if there is anything obvious.....but..I suggest to change it if it does not open when you help it with a blade on the tray and pushing the button ..