DVI did not mandate HDCP so to fix this you have to find something that is illegal here called a HDCP STRIPPER. Remember this is not legal in the USA so I can't tell you much about it.
It's most likely not a bad DVI port but the HDCP is mandated if the source has HDMI. There used to be some wiggle in that spec that is now gone.
If the model number doesn't give it away, this is an older monitor/TV. Probably around 10 years old at this point. Since I bought it, I've had to use a DVI to HDMI converter in order to play PS3. It worked fine up until recently. I started to get a "Not Supported" message when plugging everything in and turning everything on once I switched to the DVI Source. (I hadn't been using it for my PS3 for a few years).
Thinking it could be an easy fix, I replaced both the HDMI cord and DVI/HDMI adapter. Still the same problem. I have tried restarting the PS3 and turning the TV off to see if that would help. So far, nothing. I currently have the TV unplugged and I'm hoping that corrects this (I found that idea on a random forum this morning that had someone troubleshooting a bad DVI port). This is the only problem I've ever had with it. Just seems odd that one port would randomly go. I'm also hoping to not need a new TV in order to fix the problem.
Any thoughts on how I could fix this?