Mac Pro opens DVD drive on boot?

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this strange one. found after getting australia last week whenever boot mac pro opens dvd drive before continuing boot. chain of events:
  1. press power button on front of tower
  2. the chime sounds internal speaker; solid grey screen appears
  3. the dvd drive opens (and stays open)
  4. the darker-grey apple logo appears @ centre of screen
  5. the system continues boot log-in screen.
anyone got ideas or how fix it? when tried update efi firmware found dvd drive open , firmware wouldn't update; fixed when new version (i.e. third version after release of mac pro) of efi firmware came out machine updated fine.

tried resetting smc controller using button on logic board, seems have had no effect. earlier today ran software update , found new version of smc firmware waiting me; downloaded , updated that, , dvd drive opened in same way before progress bar appeared update smc firmware.

pretty odd!
 

no suggestions anyone? i'm little worried might symptom of more serious problem.
 


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