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jasnw

macrumors 6502a
Original poster
Nov 15, 2013
854
900
Seattle Area (NOT! Microsoft)
I have a 2018 Mini that's connected via HDMI to a Benq PD2700Q monitor. I bought an AZLink USB C to Mini DP cable to switch from HDMI and it won't work. I don't know if I have a bad cable (no other computer to try this out on) or if there's something else going on. I switched the input from HDMI to Mini DP on the monitor and the monitor complains that there's no cable connected. I've connected/disconnected both ends of the cable, switched the monitor on and off, and the same with the computer. No change. I'm going to return the cable, but I'm not sure what cable I should get (DP instead of Mini-DP) and from what vendor.

Also, does Benq not like Apple? All of the official manuals and website info is about connecting Benq monitors to Windows systems.
 

toronado455

macrumors regular
Apr 2, 2009
193
10
I've been having similar HDMI issues with my new (2018) Mac mini and was just about to post a similar question. I'd like to try the Mac mini with my new monitor using display port but I don't have a cable that I can use and not sure what type of cable to get.

What has been happening for me using HDMI on my old HDMI monitors is that the initial Apple logo boot up image shows, and then shortly after the screen goes black and then will not come back on and the display reports no HDMI signal. Or it has like a purple image with messed up color. This same monitor works fine via HDMI with a PC.
 

weaztek

macrumors 6502
Aug 28, 2009
342
168
Madison
I can tell you I have a 2018 Mini and an 32" LG monitor that is running well (so far) with a 6.6 foot Warrky (brand) USB-C to DisplayPort cable on Catalina.
 

Fishrrman

macrumors Core
Feb 20, 2009
22,991
8,756
OP:

Does the display have a menu choice for "auto select"?
You might try that (if you haven't tried it already).

Try this:
a. put display on "auto select"
b. boot Mini with cable attached
c. if display remains black, give Mini about 2 minutes
d. now, UNPLUG the cable from the USBc port on the Mini, then plug it back in.

Does this change anything?
 

jasnw

macrumors 6502a
Original poster
Nov 15, 2013
854
900
Seattle Area (NOT! Microsoft)
Nope, no "auto select" option. This monitor has HDMI, DP, and Mini-DP ports. No amount of changing the input port selection and turning things on/off had any impact to the situation.

One thing I find odd is the complete lack of anything about the display output port control on the Mini side. The Video panel in System Prefs doesn't "speak" of ports at all.
 

toronado455

macrumors regular
Apr 2, 2009
193
10
Nope, no "auto select" option. This monitor has HDMI, DP, and Mini-DP ports. No amount of changing the input port selection and turning things on/off had any impact to the situation.
My monitors DO have the auto-select function, but what I've found in the past is that leaving that on can actually mess things up worse. No matter, whether I manually select the input on the monitor control panel or let it auto-select, the same issues occur with the Mac mini.
One thing I find odd is the complete lack of anything about the display output port control on the Mini side. The Video panel in System Prefs doesn't "speak" of ports at all.
Would be a nice feature, though I don't know of any computer I have used that has any sort of a software video output port control. As far as I know, ALL the output ports are always "ON". Unless of course you have a descrete GPU and you switch off integrated graphics in the BIOS. But that is not such a granular control, it just simply turns all the built in ports off.
 

toronado455

macrumors regular
Apr 2, 2009
193
10
Yeah I get that. Being able to selectively choose an output port might be a way to help troubleshoot. Then again, I didn't anticipate that a brand new Mac mini was going to be my most troublesome computer purchase. ?;)
 

toronado455

macrumors regular
Apr 2, 2009
193
10
I got the above linked StarTech USB-C to DP cable and I can confirm it is working with my 2018 Mac mini on Catalina with my LG 4K 24UD58-B monitor.
 
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