I'm getting intermittent purple & green static on my TV and was hoping someone could help me do some troubleshooting. I have HDMI cables going form my Mac mini -> Denon receiver -> LCD TV. The cables are reasonably new and appear to be high quality and in good shape. The problem is intermittent -- maybe once every week or two -- and comes and goes on its own. I've attempted to isolate the problem by rearranging cables, taking the receiver out of the loop, etc, but the problem disappears and I can't reproduce it with fewer variables. Any thoughts what might be the problem? I'm happy to buy new HDMI cables (and may do that anyway), but obviously the rest of the system isn't so easy to just blindly replace.