This reader was thrilled to read this post, being intensely frustrated at a brand-new Mac Pro malfunctioning this way. He reports that (like Lloyd) he often opens his windows and that it gets cold in the room (and sometimes quite hot)-this seems to provoke the problem. But Apple probably does not even have 4K displays to test with (let alone NEC), so what are my odds of them diagnosing it? UPDATE #1 - not just Lloyd’s system (see also Update #2 and #)Ī reader with a 3.3 GHz Mac Pro and D700 GPUs and dual NEC displays reports EXACTLY the same problems (including crackling speaker noise) but with dual standard-res displays (not 4K) and with even a single display. Which means tearing down my workhorse machine and waiting for Apple to (maybe) find the problem after a week or two. Unfortunately, it looks like the 2013 Mac Pro video is at fault. Appears to be temperature sensitive: too hot (perhaps 78☏ or warmer) or too cold (65☏ or colder).

PA322UHD with different MDP cable on the Mac Pro-same problems.

But on the MacBook Pro it has run for over a year without issues.

EA244UHD swapped to Mac Pro (same cable, same port): same problems.PA322UHD swapped to MacBook Pro - no problems over several days.Here is what I’ve done which now makes me think it is the D700 GPU in the 2013 Mac Pro is going bad (or new bugs in OS X perhaps?). And neither the late 2015 iMac 5K nor the late 2013 MacBook Pro Retina has any issue. But two displays? Using two cables (swapped for proper A/B comparison). Recently, the main display ( NEC PA302W) also occassionally blinks (loses signal) also, but only for a moment.Īt first I blamed the PA322UHD display. It comes and goes, working OK for hours, then becoming unusable for 15 minutes at a time. But usually just a blink-off to no signal, then back, then off, repeatedly for several minutes. My NEC PA322UHD 4K display (critical to my daily work) has been on the blink, losing the signal, making crackling noises from its speaker (though not always), discolored image (intense magenta and/or green), mangled image, etc. SEND FEEDBACK Related: 2013 Mac Pro, 4K and 5K display, computer display, display connectivity, GPU, iMac, laptop, Mac Pro, MacBook, MacBook Pro, NEC, NEC PA302W, NEC professional displays, noise, Thunderbolt, video

Imac 27 late 2013 display lines