U2520D, not connecting to motherboard port

@padraig55  There is only one size of USB-C connector, so if the cable you have doesn’t fit in the connector you’re trying to plug it into, then one of them isn’t a USB-C connector. Can you perhaps post a photo of the ports available on your motherboard, or at least a link to its specs page or user guide? That would clarify exactly what you’re working with and therefore allow others to help you.

@padraig55  Another option to consider especially if you’re on a desktop PC would be to use the USB-C to USB-A cable, which should have come with that display. USB-C ports on desktop PCs are sometimes data-only, meaning they won’t carry video (unless the USB-C port is on the GPU itself), and in that case there really isn’t a benefit to using a USB-C to USB-C cable, since you can only run USB data on that cable anyway. So try using the USB-C to USB-A cable to handle USB data, and then either DisplayPort or HDMI for video.

Thank you for your reply. It appears that there is no video on my C connection. I tried it with a different monitor which had a small size C on both ends. There was no video transmission to the monitor from the computer. The problem I now have is that none of the three cables supplied with the monitor will plug into the computer at the other end. The best solution would appear to be to find an adaptor that will connect one of the cables supplied to an appropriate port on the computer. Can you suggest any? I took some photos of the back of the computer showing all available ports but I cannot find any way to upload them with this email. Can you help? If you email me directly at I shall send you the photos directly. The C socket has changed in size since I bought the computer some six years ago. It is now larger. 

@padraig55 There is a photo upload button when writing posts. Alternatively you could upload them to a site that allows sharing via link, but your email address was removed from your post for privacy reasons, so I can’t see it.

The C connector has not changed in size. As I said, there is only one physical port specification for USB-C at the moment. There is no “mini C” or “micro C”.

Hi Jphughan, Thank you for replying. I found the Insert Photos button and I inserted 3 pictures. However, the Upload button did not work so I think they have not been uploaded. However, the m/b is a Gigabyte Ultra Durable. The card (which has a C socket) is AMD Radeon R7 series. The computer was bought in 2016.

"The computer has two C sockets but both are too small to take the C plug supplied."
As jphughan stated, there is only one size of USB-C connector. You need to post a link to the motherboard manual showing all of its ports.

To further confuse the issue, you state, "The card (which has a C socket) is AMD Radeon R7 series.". So are you now talking about a port on the added video card or a port on the motherboard itself? Those are two different components.

@padraig55  When I search Gigabyte Ultra Durable, I end up at a page with a ton of different motherboard models, so maybe Ultra Durable is a product line rather than a specific product. The same is true of just saying that you have an AMD Radeon R7 Series. Several vendors make several variants of even a single Radeon chipset, and you’re quoting an entire series of a Radeon chipset. There just isn’t enough information to help you here. I’m not sure why the upload function isn’t working for you, but if you can’t make it work and don’t want to try posting to a cloud storage service and sharing via link, then I don’t think I can help here.

Hi Jphughan, thank you taking some much time and trouble with my problem.

The motherboard no. is Gigabyte UltraDurable  B150M -D3H-CF . (Driver-12DC1-Z170S-160CR. V 1.6).

The video card no. is Sapphire R7 240 4GB.

I have a C port(socket) on both the m/b and the video-card. As you know, the video card plugs into the m/b. Neither C port on my computer takes video.

I emailed three photos of my computer ports to Dell Tech Support this morning. I asked Satish to make them available to you.   Re: Dell Service Tag: JBF4923 [Case Number : 124207323/Service Request: 1072440010] [ ref:_00D0bGaMp._5002R1NfIGX:ref ] 

For the record, from inspection, the following ports appear. a) video connection port. This is a rectangular block, with holes, into which pins from the cable are inserted. b) approx. five serial ports, c) a blue cable attached to a port which blinks. There are a number of presently unused ports also including two C ports,

As mentioned, none of the three cables supplied by Dell will connect to any of these ports. 

If your recommendation is to buy a new monitor, what Dell monitor would you recommend that will work with my existing computer?

I suspect the Upload button did not function because I am missing the lower right side of my screen with my present monitor.

@padraig55  I am not affiliated with Dell Support, so they are not going to send me anything you send them. And you should never post a Service Tag on a public forum. Typically if a GPU has a USB-C port, it will support video, since GPUs typically aren’t just trying to give the user one more data-only USB port. Unfortunately your text description of the available ports is not helpful, and is also very likely not accurate. Serial ports have been obsolete for a very long time, but even when they were in use, I have never seen a motherboard with five of them. Unfortunately if you can’t figure out how to upload photos here or post them somewhere on the Internet that allows sharing via link, such as any cloud storage provider that provides a small amount of free storage, then I can’t help you. But if you can’t manage that, then you might be able to help YOURSELF by checking the documentation for your motherboard model and your GPU. That should include diagrams of the various available ports along with their correct names.

@padraig55  Ok, I gave in and spent more of my own time trying to find information for you. Based on your product models, is this an accurate photo of your motherboard’s port block, and is this an accurate photo of your GPU’s port block? Those were easy to find as soon as you posted your product models, so fyi maybe next time you should just do that if you’re struggling to post your own photos somewhere.

But having looked at those, there are no USB-C ports anywhere on either of those products. On the motherboard, the names of those ports, working from top to bottom and left to right, are: 2x USB 2.0, PS/2, VGA, DVI, HDMI, 2x USB 3.0, Ethernet, 2x USB 3.0, and 6x audio (for multi-channel output, line-in, and mic). On your GPU, the ports from top to bottom are VGA, HDMI, and DVI.

In terms of how to connect the U2520D to your system, you’ll need a regular HDMI cable for video. The U2520D doesn’t come with one of those, but they are cheap and easy to get. Connect the system side to your GPU’s HDMI port, not your motherboard’s HDMI port. And then if you want to use the USB ports built into the display, you will ALSO want to use the included USB-C to USB-A cable to connect the USB-C port on the display to any of the USB 3.0 ports on your motherboard. And then obviously connect power.

Hi Thorium, thank you for spending the time and effort on my problem. See the following post of 10-11-21 07:23  by jphughan. If you and he are the same person, please  accept my apologies. But he has posted accurate links to my m/b. I suggest you use these if you want to reply further.

@padraig55  You’re welcome, although HDMI and USB-C connectors do not use the same shape. HDMI is a trapezoid and USB-C is an oval. Also, if someone else solves your issue, you’re supposed to mark one or more of THEIR posts as the solution, not a post of yours where you just say that the problem is solved.