iMac USB-C to HP 233

[mBox]

Trying to connect an HP 233 LCD using a Display Port/DVI > DVI-D cable > StarTech USB-C Display Port adapter.
HP display spits out a non-signal message.
The HP can do DP, HDMI and VGA.
We also tried a VGA/DVI cable same results.
Any tips?

 

[Fishrrman]

Mac ---> USB-c to displayport adapter ----> displayport connecting cable ----> displayport input on 233.

WARNING WARNING WARNING
Not all "USB-c displayport" adapters work with all Macs.
SOME of them do.
But others DO NOT -- and will work only with 2016 MacBook Pros.
You have to read the reviews and product descriptions carefully to determine which will work, and which will not.
You must research this carefully before you buy!

 

[mBox]

Thanks, Fishrrman.
So glad this isnt my setup.
Coworker needs to extend his iMac but no budget for new Apple display.
We tried to use an older Cinema 23" and it just flickered.

 

[theluggage]

Trying to connect an HP 233 LCD using a Display Port/DVI > DVI-D cable > StarTech USB-C Display Port adapter.

...

The HP can do DP, HDMI and VGA.

Your question doesn't make sense - why are you trying to use a DVI cable when the display doesn't even have DVI?

USB-C -> DisplayPort -> DVI -> DisplayPort (which seems to be what you're describing) just isn't going to work. Ever.

You just need USB-C -> Displayport adapter -> DisplayPort cable -> the DP port on the display.

As @Fishrrman said - some USB-C to DisplayPort adapters don't work on 2017 or later Macs. To be safe, look for one that explicitly says it supports the 2017 iMac and not just the MacBook.

I've had success with this one on an 2017 iMac with various HP and Dell displays: https://plugable.com/products/usbc-dp/ (Plugs the iMac straight into the display's DP socket)

 

[mBox]

the converter provided was a StarTech USB-C DISPLAYPORT ADAPTER.
basically a USB-C with a DVI (female) end.
then I found a DP to DVI (female) converter.
using a basic DVI-D cable no signal worked.
I ordered a StarTech USB-C to DP 3foot cable.
StarTech claims it works on the iMac.

 

[theluggage]

the converter provided was a StarTech USB-C DISPLAYPORT ADAPTER.
basically a USB-C with a DVI (female) end.

Er, that would be a USB-C DVI ADAPTER then, unless its a multi-port one...
Are you sure you're not confusing DVI with full-sized (not mini) DisplayPort?

Anyway, any solution that involves converting a DisplayPort signal (which is what USB-C provides) to DVI and then back again probably isn't going to work: (a) most DP-to-DVI adapters will only convert DP to DVI, not vice-versa and (b) passive DVI adapters won't work with a USB-C adapter - they need an actual dual-mode "DisplayPort++" output from the computer.

Anyway, the USB-C to DP cable should work - although to be sure I'd go for one like the Pluggable that explicitly says on the website that it supports 2017 iMac.

 

[mBox]

Er, that would be a USB-C DVI ADAPTER then, unless its a multi-port one...
Are you sure you're not confusing DVI with full-sized (not mini) DisplayPort?

Haha I know it is. I just write down what the package says. But I did mention that its an actual DVI-D on the other end.
Thanks for the tip.
I will wait out the Amazon order and hope this works.