Fixing a Second Monitor that Flashes Black

Posted on by Larry

Here’s a quick trouble-shooting tip.

After I purchased an M2 Max Mac Studio, my second monitor – an LG 4K HDR – starting flashing to black every few minutes. It would stay black for 5 seconds or so, then return to normal

The fix was simple, but took a while to figure out.

I replaced the Thunderbolt to HDMI cable with Thunderbolt to DisplayPort. DisplayPort is the native monitor protocol for Thunderbolt and, since I replaced the cable, the monitor has worked perfectly.

SIDE NOTE

Not all Thunderbolt cables are the same. It is ABSOLUTELY true that you get what you pay for. I made a point to buy a Belkin USB-C to DisplayPort 1.4 cable. ($30 US) It cost twice as much as the cheap knock-offs, but, unlike them, it also works.


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2 Responses to Fixing a Second Monitor that Flashes Black

  1. Gary Tetz says:

    What primary monitor are you using with your Mac Studio?

  2. Larry says:

    Gary:

    I’m using three: (2) LG 27″ UHD 4K and (1) BenQ 2725U-T

    Here’s my review of the LG:
    https://larryjordan.com/articles/product-review-lg-27-uhd-4k-display-27ul600-w/

    Here’s my review of the BenQ:
    https://larryjordan.com/articles/review-benq-pd2725u-t-computer-monitor/

    Larry

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