Super Drive tray keeps popping open

This has been going on for me nearly since I bought my MacPro three years ago. Once after I had brought it in for repairs the tech guys were able to fix the problem but after a few months it started popping open again on startup. I'd love to know why and how to fix it.

Hi, Im having the same problem. Every time i here the mac startup sound, my macpro busts me! the two superdrives eject...

Very annoying.. Someones help is very much appreciated. Searching a cure for 2 years!

My optical drives started opening whenever I cold booted my machine just after I upgraded to Snow Leopard. I assumed the new OS was responsible, but it turns out that a change I made because of SL was the culprit.

Under Leopard, my Logitech wireless USB headset did not work for speech recognition. Since I only used the headset occasionally, I decided to leave the USB receiver unplugged when I wasn't using it. Snow Leopard has now made the headset more useful because speech recognition now works. So I opted to keep the USB receiver always plugged in. I didn't associate this change with the optical drives opening until it finally dawned on me that this is the only big change I had made recently. Sure enough, once I unplugged the USB receiver the optical drives ceased opening when I booted up.

I would, therefore, try unplugging all USB devices (except for your keyboard and mouse) and see if your drives stop opening when booting.

Hi all,
I spoke to an engineer at Apple about this and he mentioned it was a strange problem that he had not heard of before. He said it sounds like there is some sort of EFI update that the boot is looking for which is why its opening the disks. I have a late 2008 Mac pro 8 core 2gb and two super drives from APple. This has been happening as far back as I can remember. Even before updating to snow Kitty.
While he was helping me with a drive installation I mentioned this irritating issue and he talked in engineer language but I did manage to catch EFI and looking for an update. Apparently the EFI is its own component and may not get updated with normal system updates and may need to be run individually. I actually downloaded the most recent update and tried to run it but the preinstall check says I dont need it and it fails out of the install.
So needless to say, I still have the same problem on cold boots and no solution. Maybe you all will have more luck with the EFI update than I did.

In my experience the superdrive opening at startup is usually a USB issue (note: holding the mouse button down at startup is suppose to open the superdrive, but this doesn't necessarily mean it's a mouse issue). Try unplugging all USB devices and see if the problem continues, if not add USB items back to determine which one is the issue.

Ill be darn. I only had a firewire hard drive and a WAcom tablet in the usb.
Unplugged them both and no drives opened on reboot. Turns out its the Wacom causing the trouble.
Quite interesting and thanks for the reminder to try that. I read it earlier but thought that was too simple a thing to consider.