My grandson has an Xbox connected to a monitor. No tv. How can I connect a soundboard to...

if the monitor has a headphone jack you can hook that up to a soundbar or speakers with a 3.5mm connector, if not then you would need to get a soundbar with hdmi connection with passthrough. or you could connect the soundbar to the controllers headphone jack but you would lose the ability to use mic.

there are also hdmi splitters that split off the audio to a headphone jack or optical.

Hello Deborah, sorry to hear you're having trouble.

It depends on the console. If he has an Xbox up to the One X then there should be an Optical Port on the back. Most sound bars will offer an optical in option for this as they offer a really good audio option for the console. If he's using the Xbox Series X or S then the Optical Port is not a feature so he would need to purchase either an Xbox compatable Wireless headset or a wired headset that can plug into his controller.

Have you tried the steps on the following page:
support.xbox.com/.../tv-or-monitor-screen-is-blank-while-connected

This will show you how to reset your Xbox out put settings, and can hopefully reset the connection to your HDMI. If this doesn't work, do you have another monitor/tv you can test it with? Make sure it isn't just your monitor? Also is your monitor on and
set to the correct input?

I think I didn't add enough info to my main comment. My xbox one in fulling connected to my monitor. I'm just trying to set up my cable box to it. My xbox knows how to turn on and off my cable box, but the Xbox can not recognize my monitor through the whole
"Is it muted now" process. Since I'm using a HP monitor I selected HP TV and it didn't work. I'm trying to see what else I can do to try to connect my cable box to my monitor through my xbox one

H there,

there are several cables that can be used to connect the console to a pc monitor, most used is probably the the vga cable. You can find it here :

support.xbox.com/.../connect-xbox-360-console-tv

I don't know the price and you might also need something else to connect audio, depending on the monitor (if it has speakers or not)

If you have any questions, just let us know