Why are my DVD drives opening on boot up?

For several days now, whenever I start my Mac Pro, early in the boot process both of my DVD drives open their trays. After some period of time goes by after the boot process is complete, they'll both go retract, but something is causing this and if anyone has any ideas as to what that is, please let me know. I'm having a mouse problem and these both started at about the same time, but I'm unaware of what if anything I did to cause it...
Thanks in advance.
Rock

Hi Rocky,
To be honest i have no idea what can cause that but here's what came to mind for me...
1. Check with software update if your Mac Pro has the latest software and firmware.
2. Go to system preferences > Startup Disk, select the correct startup disk by clicking it (just to make sure). The DVD drive could be opening 'asking' for a boot disc if it can not find the hard drive with a valid OS on it in the first few seconds. This is just a theory, not sure if it's accurate
3. Go to Applications > Utilities and start Disk utility. Select your startup drive and click Repair Permissions. When done restart the Mac. Even if this doesn't fix the issue, it's good to run once in a while.

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