G4 CD tray spitting out at startup

Every time I start up my G4 the superdrive cd tray spits out and I have to push it back in or press the button to get it to retract. This seems like a startup command but I can't find such a command anywhere in the system preferences. I'm not aware of any software that launches at startup that would cause the tray to pop out. Where would I look for this on the machine so that I can make it stop?
Thanks for any help you can provide.

Hi, Marcus -
There is a hardware command that can do that. At startup, if the mouse button is held down it instructs the Mac to eject all removable media; this instruction is invoked before any software is loaded.
Sometimes an attached USB device can (in some manner) generate a signal that the Mac interprets as being a mouse-down event. Devices that have been specifically linked to this behavior are an iMate adapter, a digitizing tablet, and a dongle, although any attached USB device can be the cause.
Disconnecting all attached USB devices (except keyboard and mouse) and then reattaching them one at a time and testing can often reveal the culprit.
Sometimes inserting a self-powered hub between the offending device and the Mac can filter out the signal. When this does not work, or is not possible (such as with many dongles), then living with the problem may be the only thing to do.

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