if the disc tray wont open, give the console a nice smack in the face.
lay the system on its side (where the disc tray is horizontal), and then hit the console right above the disc tray, but in the middle of the tray portion. this needs to be done when you press the button, so as the console is trying to open the tray, you give it a smack, and that will assist it in completing the task. this is usually a problem with there is no disc inside the system. when there is a disc inside, they tray is weighed down and that is usually enough to keep it from sticking. that will usually get the thing open. it might have to be a good hit though. i have provided a picture on where exactly to hit it. good luck :)