My classic Tivo has been working for years just fine. Recently the HDMI output has been a bit crackerly and stopped working a couple of days ago.
I have used a new HDMI cable and it in various inputs on my TV and also on my HDMI projector. It worked fine on both before.
The box still displays via SCART
I tried the "putting the devices into standby and taking them out of standby in various orders" technique which was suggested on teh forum.
All to no avail.
So SCART works, HDMI does not - what else can I try?
Try phoning and reporting the fault.