In my experience,when I got the "mode not supported" message,it was talking about the resolution of my computer. In your Samsung manual it addresses that.
This one is a puzzler...I have a Samsung LNS3251D with 2 hmdi inputs. In DVI/HDMI Input 1 I plugged in my pc (dvi out, using a dvi to hdmi adapter + audio cable into the TV). Input 2 has hdmi to hdmi from my cable set top box.
All has been great until I replaced my computer, which has an hdmi out... for some reason when I plugged in the computer's hdmi cable into the input 1 of the tv, input 2 (the cable STB) stopped working, giving me a "not supported mode" message.
Interestingly, when I switch sources from input1 to 2, the input1 (ie the computer) displays for a brief moment on input2, then the screen goes black, then the not supported mode message comes on.
This happens regardless of which hdmi inputs I plug into--I've switched inputs and the STB still does not display.
I'm assuming I can have 2 hdmi inputs simultaneously, right?
My workaround is using my new computer's dvi out + audio cables into input1, in order to allow my STB hdmi output to show, but that doesnt seem like it should be, and I'd like to get digital audio into the TV from my computer.
Any suggestions would be helpful! Thanks.