Door wouldn't open on one of those I found - the tiny drve belt at the front under the tray was limp but replacement didn't fix it. Next I tried a bigger motor pulley off an old PC drive - sometimes opened, sometimes didn't. You can remove the bezel off the front of the tray to expose the manual release, you can use a toothpick to press that - sometimes the tray eases after a while and starts working - sometimes you have to give it a shove.