Xbox 360 turning on but no display on any tv or by using different hdmi cable

Try different HDMI cords or HDMI inputs on your son's TV (if available). Since the Xbox 360 S is displaying fine on your own TV, the issue seems to lie with either a bad cable or a TV issue, according to what you've said.

See what happens when you use a different HDMI cable, even the one you used to plug the Xbox into your TV. If needed, you could find HDMI cables at the dollar store.

I would set try to set the display and sound settings on console, set tv type to Auto, after that UNPLUG HDMI cable from both ends, now UNPLUG POWER to CONSOLE and TV - then wait 2 mins, plug power back in for TV, now use a DIFFERENT HDMI cable - then
plug power back in for CONSOLE, turn on and now see if any change, also try a different HDMI PORT on TV. after test to see if any change.

I am so sorry, I gave you the 360 directions, here is the Xbox One, forgive me!

Confirm that both your TV and Xbox One console are powered on.

Check that your TV is set to the proper input signal (HDMI).

Check that the HDMI cable connection to your console is secure.

Check that the HDMI cable connection to your TV is secure.

Perform a cold boot on your Xbox One console by holding the power button on the front of the console for approximately 10 seconds, and then power on again.

Reset your display settings. Here's how:

If there’s a disc in the Xbox One console, eject it.

On the console, press and hold the Xbox button for five seconds to turn off the console.

Press and hold the Xbox button and the Eject button until you hear a beep to turn on the console.

Note This will boot your console in a low resolution mode (640 × 480). To reset these settings again, press the Menu button, select Settings, and then select Display & sound.

For more information on advanced display settings, see How to adjust the display settings on your Xbox One console.

Try plugging the HDMI cable into a different HDMI port on your TV.

Try using a different HDMI cable to connect your console to your TV.

Try connecting your console to a different TV.

Hey, there!

Thank you for contacting us and welcome to the Microsoft Community.

My name is Darhyl. I'm an Independent Advisor and I will do my best to help you sort this out.

I'm sorry you are experiencing any trouble right now. No worries, I'm here to help you.

Issues like this that involve with the Xbox visual display could be due to Xbox console hdmi port or the TV port.

You can try the following steps in order to fix this.

Confirm that both your TV and console are turned on

Check that your TV is set to the correct input signal (HDMI)

Check that the HDMI cable connections to your console and to your TV are secure

Confirm that the HDMI cable is connected to the "out to TV" port on the console

Plug the HDMI cable into a different HDMI port on your TV

Use a different HDMI cable to connect your console to your TV

Connect your console to a different TV

Power cycle your console by pressing and holding the Power button for 10 seconds to turn off the console, and then turning it on again

Here's your reference link: https://support.xbox.com/en-US/help/hardware-ne...

If these steps don't work, please let me know.

Confirm that both your TV and Xbox One console are powered on.

Check that your TV is set to the proper input signal (HDMI).

Check that the HDMI cable connection to your console is secure.

Check that the HDMI cable connection to your TV is secure.

Perform a cold boot on your Xbox One console by holding the power button on the front of the console for approximately 10 seconds, and then power on again.

Reset your display settings. Here's how:

If there’s a disc in the Xbox One console, eject it.

On the console, press and hold the Xbox button for five seconds to turn off the console.

Press and hold the Xbox button and the Eject button until you hear a beep to turn on the console.

Note This will boot your console in a low resolution mode (640 × 480). To reset these settings again, press the Menu button, select Settings, and then select Display & sound.

For more information on advanced display settings, see How to adjust the display settings on your Xbox One console.

Try plugging the HDMI cable into a different HDMI port on your TV.

Try using a different HDMI cable to connect your console to your TV.

Try connecting your console to a different TV.