Macbook no longer detects TV as display.

I have a Macbook, purchased around late April this year, I usually connect it to my Samsung 32" LCD TV using an Apple mini display port to DVI adapter and a fairly long DVI to HDMI cable that runs under my mattress to the TV. It used to connect immediately and display on the TV as soon as I plugged it in. Recently, it stopped connnecting so promptly, and a restart of the Macbook and unplugging and plugging the cable back into the back of the TV to make it work. This has since ceased to resolve the problem. The detect displays button does not detect the TV either. Why could it have suddenly deteriorated? How could I resolve this?

John Vargo wrote:
When I hook my computer up in my home office I connect an external display using the Apple VGA dongle.
Previously, when I inserted the dongle the display would blank out for a moment while detecting the display, then reappear with the VGA output enabled. This is no longer the case. When I insert the dongle, my screen doesn't blank out, and the VGA output will not enable. Its like it doesn't even know I'm inserting the dongle.
I have inspected the dongle for broken pins and dirt, but it appears to be making a good connection.
Is there something wrong with my Mac, or is it the dongle? Is it worth taking this to a genius bar in hopes they can try a different dongle, or shed some light on the situation? Thanks in advance.
My usual question for things like this is what was the very last thing you did with the computer before this issue began?
I would guess the dongle is kaput, but you might check your logs, the console and even the activity monitor as you plug the dongle in.
Other than that, your Genius bar sounds good to me.

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