Display Glitches with nMP


i purchased refurbished nmp, late 2013, 6 core dual d700. on latest yosemite release.

issue: regardless of display connected, bad glitches, quick vertical shifts in gui output.

monitors tried: nec pa272w, apple imac (tdm), eizo cg247.
cables tried: thunderbolt thunderbolt, thunderbolt mdp, thunderbolt dp.

can't monitors. running "native resolution" (2560x1440).

bad macpro? bad os?
 

bad graphic card surly. can make appointment see genius@apple if still under warranty.
 


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