SHARP TV won't display MacBook.

I use my SHARP tv as a monitor for my MacBook often and I've never had an issue. I just use the HDMI port on the TV.
Now, the TV won't display anything. Everything is plugged in properly, and the Mac even responds as if it is plugged into the TV... So, it seems to detect the Sharp TV. However, the TV isn't responding at all. It still responds to the DVD player, etc. on the other inputs, just not to the Mac. Any thoughts or suggestions would be appreciated! Thanks.

How are you getting from miniDVI to HDMI? (adapter(s) type?)
Have you been able to test your macbook on another tv (or DVI monitor?)
It could be a software thing (e.g. related to a system update) as in this thread:
Macbook (Late 2007) External Display Not Working
http://discussions.apple.com/thread.jspa?threadID=2055760&tstart=45
Or it could be something else entirely more mysterious:
Macbook stopped working with a certain specific display (external DVI)
http://discussions.apple.com/thread.jspa?threadID=2081807&tstart=0

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