I've stuck this under Home Theatre as, although my issue is with a PS3 as source, I've read about this affecting other sources and seems specific to the TVs.
Last night, I realised I didn't have my PS3 setup correctly to output full HD to my 32" Samsung Series-6 LCD TV. I changed the settings in my PS3, but when I saved the updated settings, the TV looked for the signal then displayed "Mode Not Supported". I played around with the settings more, and it seems the best I can do is 1080i.
I've done some digging on the interweb, and have found similar stories but no resolution (even by Samsung themselves) e.g. CNET thread. Has anyone else encountered this issue and managed to get it working?
The HDMI cable I'm using is the MadCatz HDMI Cable for PS3. It's obviously not a high-end cable, and some people online attribute this issue to cheaper cables, but others have the same issue on expensive cables too.
My PS3 is running the most recent firmware update and my TV is on firmware 2008/09/09_001006.
EDIT: I forgot to mention that I'm pretty sure I've played Blu-Ray movies before through the PS3, and it switched fine to 1080p.