That's all the obvious things then. If the AV, HDMI or TV was causing this, then taking it out of the equation should identify it.
If the TiVo is causing it, a reboot should solve that.
If neither apply, then it points the finger at a possible box fault. Given that a box replacement will lose all your recordings anyway, you can try working through the graduated levels of reset under Home > help & Settings > Clear or restart.
Each level of reset has on-screen guidance as to what will be lost - otherwise you can wait for forum staff to pick this post up which may take a day or so. I can't imagine their remote diagnostics would pick up anything that a bit of "investigative troubleshooting" won't - but you never know.
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I'm very sorry to hear that you're having some trouble with the sound from your TiVo box. I can see that you've gone through some basic checks and diagnostics with @japitts - checking the connections is always a good starting point, so it's good that we've got them boxed off already.
Have you been able to perform a reboot of the box yet? You can find more information on how to do this here.
Hi Zach. Yes, I've gone through all the basics, wiring, swapping leads around, cold reboot etc. Still only picture but no sound. I think I need to order a new box but unfortunately it's now impossible to talk to another human on the phone
Sorry to hear this is still happening
I am more than happy to take a look at this for you
I will need to send you a private message to pass security
If you can check the purple envelope top right of your screen that would be great