Disk Tray won't open/ read disks

The DVD drive on my laptop doesn't open when I press the button to open it, but will open if I use the manual "paper clip" method while the power is off. The disk does spin in the tray, but there is usually a light on the outside of the tray when the computer's on or when I try to open it - this is now off most of the time, only coming on before Vista starts, and then remaining off after the windows boot screen. Nothing happens if I put a new disk into the tray, except that it starts spinning. What do I do?? Any help would be much appreciated. NB as far as I can tell the data cable is intact and connected, but I don't really want to risk opening up the laptop to get a closer look. Plus I have absolutely no idea how to remove or replace the drive. Thanks

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