The DVI output on exacqVision systems with RAID controller cards might be deactivated on systems manufactured before 2011. This applied to all 4U and RAID exacqVision A-Series systems manufactured during that period. For those systems, you must use the VGA output when connecting a monitor.
DVI-Output-not-Available-on-4U-RAID-exacqVision-A-Series-Systems.pdf