|I've worked with alot of those trying to figure out why they do that. I noticed that when I removed the top cover of the cdrom the tray would open and close with no problem. Put the cover back on and the problem would return.|
The covers have an indention above the drive spindle that hold a loose plastic piece that surrounds a piece of metal (I believe it's generically called a 'clamp' or 'clamper'). The center spindle ol the cdrom is magnetic. When the tray is closed the clamper magnetically locks onto the spindle to hold the cd in place.
When you press the button to open the tray the first thing that happens is that magnetic hold must be broken. If the motor or belt is weak that magnetic bond can't be broken and the tray doesn't open.
Anyway, that's my best guess after going through a dozen or so of them.
You're not really green until you're soylent green.