HDMI out of range?

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Hello everyone,

Recently I've noticed a problem and I hope someone could explain it for me.

I've got a KDL 32S3000  (which has 3 HDMI ports) and until now I've only used 2 of these.

Now I need to hook up the third (which is in the side by the PC input) but when I do so I get a black screen with the message "out of range".

What confuses me is, if I take my PS3 for instance and connect it to one of the other ports it works fine, but when I put it in the side one I get that message.

Is the side port just broken? Is there something I'm missing?

Any help would be greatly appreciated!