Option key not giving me any drives to boot from

Hello,
I have just installed Win 8.1 via Boot Camp on my Mac Pro (mid-2010) using OSX10.9. I was under the impression that on restarting if I pressed the option key, then I would get all available drives and then be able to choose which one to boot from but in my case, not so. Rebooted and the option key is recognised; I get a blank screen (as I would expect) and a cursor which is controllable but then no drive options appear.
I have three possible boot disks: a Win8.1 partition and a 10.9 partition on on internal HD plus a 10.9 on a Sonnet Tempo SSD plugged into my PCIe slot. I am wondering if the Tempo is the issue and Boot Camp does not like it (is it Boot Camp that controls the option key restart process?). Before I start pulling the Mac Pro apart, I was hoping to get some advice please.
Any ideas what could be wrong please? Thank you.

No, it won't show up in Disk Utility, but have a look at the screen shot. Straight off your hard disk (if you're on Lion this will be at the BOTTOM of your sidebar pane in Finder). If you have the folder marked in yellow and the folder marked in purple called rEFItBlesser please TRASH both.
Be CLEAR: do not remove the Library folder or the StartupItems folder (both marked in purple, too). Remove only the rEFItBlesser folder at the end of the path. You can (and should) remove the whole of the efi Folder (in yellow).
Then restart.
Message was edited by: softwater (corrected 'file' to 'folder')

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Option key not giving me any drives to boot from

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