Mac Pro does not recognize inserted DVDs after startup

When i reboot my mac pro and log in my user in the moment the mac pro starts the finder it tells me that the inserted DVDs could not be recognized. my mac then ask me what it should do: ignore or eject. this happens everytime i at the startup.
i have a second DVD drive installed. is it a problem that causes out of wrong jumper settings?
from time to time i have startup problems with my mac and some people told me it is a major problem and i should call the support. is this another sign that my mac has a problem?
Thanks for your help

I have that same combo working here. Other than the Sony not reading older 4X DVD "Sony" discs, and saying they are CDs, it operates perfectly. If both drives are set to cable select like hatter said, all should be well.
Michael

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