Superdrive keeps ejecting disk on Mavericks sign on.

I've just installed a fresh copy of Mavericks and have a strange problem.
My Apple Mac Pro "Eight Core" 2.4 (2010/Westmere) boots up fine until it gets to the Mavericks sign on screen and if there is a disk inside the superdrive then ejects it. I have 1 superdrive and a MCE Blu-Ray drive and both behave in the same manner.
So, I booted up from my old LM and it doesnt do it, I cant ever recall my Mac doing this in LM, Lion or SL, Leopard.
My Mavericks install has various software installed on it and thought it may be one of the apps playing up and causing the disk to eject. I formated a new drive and installed Maverick on it and it still ejected the disk.
So, software ruled out! I set about resetting my NVRAM & PRAM still didn't cure it.
Booted up in Safe Mode and still the same.
Ran Apple Hardware Test (AHT) no problems found.
Ran pernissions repair and still keeps doing it.
I know the simplest thing would be not to have a disk inside the drive but it's little things like this that eeeeerrrrrr!!!!!! you know what I mean!
I'm out of ideas, anyone else have this problem? and help?
Below is my hardware overview:
  Model Name:          Mac Pro
  Model Identifier:          MacPro5,1
  Processor Name:          Quad-Core Intel Xeon
  Processor Speed:          2.4 GHz
  Number of Processors:          2
  Total Number of Cores:          8
  L2 Cache (per Core):          256 KB
  L3 Cache (per Processor):          12 MB
  Memory:          8 GB
  Processor Interconnect Speed:          5.86 GT/s
  Boot ROM Version:          MP51.007F.B03
  SMC Version (system):          1.39f11
  SMC Version (processor tray):          1.39f11
  Serial Number (system):          YM03420YEUF
  Serial Number (processor tray):          J503303RYBH8A   
  Hardware UUID:          53A5F426-72FB-5420-9B33-00BD183DAC49

Anyone????

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