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  • Have you tried entirely different monitors? Windows keeps information about a monitor, I had a problem where my 2 monitors would work before Windows booted, but once in Windows the second monitor wouldn't go online. I could only solve it by switching the two monitors around, nothing else would work. In other words physically switch the two computers and see if it will work then.
    – Ramhound
    Commented Jan 13, 2015 at 12:38
  • We have tried a different set of monitors. Today we've ruled out hardware as the cause by swapping the hard drive from a working one. It's definitely something in the os/ drivers/ software.
    – chip
    Commented Jan 14, 2015 at 2:13