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I have a 13” MacBook Air (mid 2013) with OSX Yosemite and bought a BenQ SW271. It was all working nicely in 1440p through DisplayPort cable. After update to High Sierra it shows no signal detected but in MacOs i can see the monitor is connected and i can change the resolution etc.. I tried reinstall MacOs multiple times also from internet recovery(option+cmd+r), reset nvram, smc, changing resolution, plug unplug, turning it off for a day all kind of voodoo I found on YT but so far no luck. I called Apple but they didn’t have solution until now. Any idea what might be the problem?

  • Is it an aftermarket DP cable? – Harcker Jan 15 '18 at 10:27
  • It’s a cable that came with the monitor. I don’t see any branding on it just the DisplayPort marks. – emKaroly Jan 15 '18 at 10:29
  • I hate to suggest it, but maybe try SwitchResX and see if that works? – JMY1000 Jan 15 '18 at 10:56
  • Already played with it, no luck... – emKaroly Jan 15 '18 at 10:57

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