X100e External VGA Issue

Hello,
            We have a X100e that has developed a problem with the external VGA port no longer sending video to a monitor.  We have replaced the video drivers, updated the video driver, replaced cables and monitors, checked the BIOS and basically everything we can think of.  Has anyone else experienced this?  Have you found a resolution?  Thought we'd check here first before placing a support call.
Thanks!

Thanks both for you replies.
Still with no success. BIOS options change nothing, windows value added package already latest version. reinstalled anyway. But still nothing.
I already switch the monitors via Fn&F5, either extended or clone or individual. None work.
The fact it shows this symptoms in DOS I suspect points to hardware... doh!
Thanks for all you help though!

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