I have an irritating colour corruptiopn coming from something in my AV setup. I have had a Denon AVR2113 since Xmas 2012. I have moved all my AV to a new cabinet which has less air space than the previous open air shelf it was on. It now seems that it is after a while causing video colour corrupton such that the video output turns predominantly purple. To cure this, I can change the HDMI input on my TV away from the Denon input, and then back, and it is resolved until it goes again. This fix suggests to me that it might not be the Denon receiver. However, I ran without the Denon operating for two weeks, and the issue never happened. When the Denon is active, this discolouration will occur after an hour perhaps. As well as the colour going, sometimes the audio will go strange. Sometimes with the purple, and sometimes not. These occasional issues are always the hardest to diagnose. Any ideas what to look at as being the culprit. It could be many parts of my system. My system is a Sky 2tb feeding the Denon, and via passthru to a Panasonic LED TV. Help very much appreciated.