Trouble Using Bit-Locker and TPM with a Dell Optiplex 580 BIOS

I've enabled a TPM chip on a Dell Optiplex 580 and configured Bit-Locker (win 7 enterprise). Anytime a USB device is pluggen in or out, then it requires an external bitlocker key to continue to boot.
What is happening is the BIOS recognizes a change (from a new/removed device) and locks the TPM (where the key is stored). I need to be able to remove a USB and not worry about a mouse or kebord failure.
Called Dell. They said it was a "feature," but I have many others that dont do this. How can I turn off BIOS "plug and play"?
smisupportAsked:
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Mel_PembleCommented:
Set the boot order so that the Hard Disk is booted to before any USB key.

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smisupportAuthor Commented:
This didnt actually work, but was close. Not until all USB boot options were REMOVED from the boot options did it work.
What happens is that if the TPM notices any change to something in the boot list (e.g., a usb drive added), then it will balk at it and not boot.
smisupportAuthor Commented:
The USB boot entries have to be completely REMOVED in order for the TPM not to notice a USB device added or removed.
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