Mac mini 2014 - Random horizontal line

- Mac mini 2014 (Intel Iris Graphics)
- MDP to DVI Adapter
Line disappeared when mouse move or scrolling. Adapter or GPU problem?
Thank you

What freezes? The external SSD or the Mac?
- My plextor m6s external SSD usb3 with enclosure. 
Do you have any problems with the Mac?
- After freeze my mac restart and boot to 5400rpm HD.
- No SSD usb3 icon on my desktop I have to unplug and plug it back to use my SSD again.
  I'm not really sure what the problem , may be from my SSD.
Thank you.

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    Report generated 21 Dec 2014 14:48:42 CET
    Click the [Support] links for help with non-Apple products.
    Click the [Details] links for more information about that line.
    Click the [Adware] links for help removing adware.
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      Mac mini (Late 2014) (Verified)
      Mac mini - model: Macmini7,1
      1 2.6 GHz Intel Core i5 CPU: 2-core
      8 GB RAM Not upgradeable
      BANK 0/DIMM0
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      BenQ GW2760 1920 x 1080 @ 60 Hz
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      EFI (disk0s1) <not mounted> : 210 MB
      Recovery HD (disk0s3) <not mounted>  [Recovery]: 650 MB
      Macintosh HD (disk1) / : 998.98 GB (945.21 GB free)
      Core Storage: disk0s2 999.35 GB Online
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