Server wont reboot if external USB Backup drive is plugged in?!?!?!

SO I just had the biggest scare of my life!!!!
I am running a fairly new server 2012 R2 Essentials system, only a week or so old :)
anyway I just turned the backup on to an external 1T USB HD a day or so ago.
Tonight there was a windows update that required the server to reboot....server reboots.
and windows wont start!!!!!!!!!!!!!!!! I have just wasted the last 6 hours trying to fix the MBR via a myriad of methods with no avail.
Finally I unplug the USB Backup drive and she boots just fine!!!! WTF?!??!?! are you serious?
this needs to be fixed NOW!

My vote would be for BIOS settings also.
Robert Pearman SBS MVP
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