[PROBLEM] How to disable and then enable HDMI output

[IriDium]

None of this should be necessary.

I would look at checking the HDMI cable - try a good new one - and the connection into the RPi (Does it move around). This sounds more like a H/W problem than a S/W issue.

(Also connecting/unconnecting any device whilst powered on is not a good idea.)

This will be a process of elimination -
1) Try the analogue audio out - does that work?
2) Wiggle the HDMI cable in the RPi and TV.

If all else fails, post the xbmc.log and output from dmesg as explained in "Please read before you post"