[MilanoChris]

I've now fixed this, so I thought I'd put up what it was in case anyone else has the same issue.

After reading around it seems that the circuit latches can get stuck open, to solve follow these steps:

* Power off the monitor
* Power off the console
* Disconnect all cabling from the bottom and/or sides of the monitor (especially the power cord)
* Press and hold the monitor power button down for 5 seconds
* Reconnect the game console to the monitor component
* Reconnect the power cord to the monitor
* Power on the game console
* Power on the monitor
* Press the monitor Input button and switch to #5 Component