Why Is Xfinity Cable Box HDMI Not Working?

An Xfinity cable box HDMI not working is one of the common problems that users face.

In this troubleshooting guide, find out why your HDMI is not working and, importantly, how to fix the problem.

The current Xfinity cable box uses High-Definition Multimedia Interface (HDMI). At times, your cable box’s HDMI can fail because of one reason or another.

When your HDMI is not working, the problem could be wrong TV input, a loose HDMI connection, a faulty HDMI cable, a faulty HDMI port, a frozen cable box, or a faulty cable box.

If your cable box’s HDMI is not working, you came to the right place. We have highlighted the reasons why Xfinity cable box HDMI is not working and, importantly, how to fix the problem.

How to Fix Xfinity Cable Box HDMI Not Working

Why is my cable box not working? This is one of the common questions that Xfinity cable box users ask on forums.

Your cable box HDMI can fail because of several reasons. It could be a minor issue that you can solve yourself or a major issue that will need the intervention of Xfinity technicians.

Step #1. Ensure the HDMI Connection is Correct

Now that you can’t watch TV, the first thing you need to do is make sure that you have connected your HDMI properly.

Below is a guide on how to set up your Xfinity cable box with HDMI.

• Get a working HDMI cable
• Plug it in the HDMI Out port that is at the back of your cable box
• Plug the other end of the HDMI into your TV’s HDMI port
• Turn TV on and set it to appropriate HDMI input

If everything is working fine, you should be able to watch TV without any problem.

But what if things don’t work? Below are some of the reasons that can cause your Xfinity cable box HDMI not to work and how to solve the problem.

Step #2. Check TV Input

If your HDMI is not working, the problem could be the wrong TV input. Use the TV input/Source button to toggle the different TV inputs.

If this is the problem, you should be able to watch TV once you are on the correct TV input.

Step #3. Check HDMI Connection

Another reason your cable box HDMI is not working is an improper connection.

First, make sure you have hooked it to the correct port. Then, ensure the cable is fixed tightly on both the cable box and TV. A loose HDMI connection will result in a bad signal.

Step #4. Test HDMI Cable

If you are on the correct input, and your HDMI cable is connected properly, but you still can’t watch TV, then you will have to test whether your HDMI cable is in good working condition.

There are many HDMI testers on the market that can help you diagnose a faulty HDMI cable.

Note: If you don't have a multimeter or an HDMI cable tester, you can try a new HDMI. 

If the old cable was faulty, you should be able to watch TV with the new cable.

Step #5. Try a Different Port

Another reason your Xfinity cable box HDMI is not working is a faulty TV or cable box HDMI port. That said, you will have to try connecting to a different port and see if the cable box will work.

Step #6. Restart Cable Box

Your cable box HDMI can also fail because of a simple bug that can be fixed by just restarting the cable box.

Below is a step-by-step guide for restarting your Xfinity cable box.

1. Press the A button on the Xfinity cable box remote to access the Help menu.
2. Scroll to the Restart option and press OK.
3. The cable box will restart in a few minutes.

Once the restart is complete, check if the HDMI is working.

Note: You can also restart the cable box from My Account Online, Xfinity My Account app, or Device Settings. 

Restarting the cable box will only refresh your system, but your stored data will remain.

Step #7. Reset Cable Box

If restarting the cable box has not solved the problem, you may have to reset the cable box.

There are two ways of resetting your cable box.

(a) How to Reset Xfinity Cable Box Using My Account App

Follow these steps to reset your Xfinity cable box using your app:

Step 1: Launch the Xfinity My Account App.

Step 2: Navigate to Overview Menu and go to the TV option.

Step 3: Select the device.

Step 4: Click on the Troubleshoot option and press Continue.

Step 5: Select System Refresh.

(b) How to Reset Xfinity Cable Box Using the Restore Default Method

Follow these steps to reset your Xfinity cable box using the default option:

Step 1: Hold your cable box’s power button.

Step 2: Check the blinking green light to confirm the cable box is on.

Step 3: Press the Power and Menu buttons to open User Settings.

Step 4: Hold the Up and Down buttons together to launch the Restore Defaults option.

Step 5: Press the Right button and OK to start the reset process.

Further Troubleshooting

The above are some of the working fixes for Xfinity cable box HDMI malfunction. If none of the methods work for you, you might have to contact Xfinity for further troubleshooting.

It could be that your cable box has hardware problems, so they will have it fixed or replace it if it is still under warranty.

Below are some of the channels you can get further help.

• Telephone
• Chat with Xfinity Assistant
• Visit Xfinity communities (Messenger, Twitter, Reddit, or Xfinity Support Forums)
• Take the cable box to an Xfinity store around you

An Xfinity cable box HDMI that is not working can be caused by a wrong TV source, bad HDMI cable, faulty HDMI port, loose HDMI connection, a frozen cable box, or faulty cable box hardware.

Read Next: How to Move Xfinity Router to Another Room?

Wrapping Up

That’s it, folks, a guide on troubleshooting and fixing the Xfinity cable box HDMI not working. As you have seen, it could be a simple problem that you can fix in a matter of minutes.

If none of the fixes above work for you, it’s better if you contact Xfinity to have the problem solved.