As I’m somewhat weak in English language, so I’ cant become clear about your problem as described.
Please let me knlw some more information as described below.
 Is the mother board working fine with DVI-I port from in the first time run?
[ if so then go to use that HDD which gave you absolutely no problem].
 If your Monitor works good in earlier days ( before using cashcard HDD), but not presently working. First check the DVI-I connecting cable and it’s socket-pins thoroughly (find any break or bended pins).
 If the health-state of the said cable is apparently OK then check the same cable to another system whether working or not.
 If the problem still not resolved check the DVI-I port both for your monitor and mother board with a lance or magnifying glass to find dust or fiber stocked inside there.
 if everything above is ok then replace another hard disk and install os with driver software given with that motherboard. Some times disk formatted in other machine and with no correct driver then this type of problem arises.
Hope you may resolve your problem.
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Shiba1918, you can also try doing a system restore on your computer to the last working state.
Check if your board is running the latest BIOS version available. If not, you can download it in the following URL Intel® Download Center