MacBook to TV connection -- HELP!

I have a MacBook 6.1, which I have connected to my Sony TV using the mini-display-port with an HDMI. This set-up has worked for a couple years now, but it stopped working when I got back from vacation this week. The TV registers no connection whatsoever. The MacBook sees the connection sometimes, and I can see that all of the display settings are correct. (Sometimes the MacBook screen flashes blue, like it would when the connection is first established, but it does so continuously until unplugged.)
I believe the last time I had problems with this connection, it ended up being an update to OS X that had caused it.  Any ideas on how to fix it this time?

Have to tried another hdmi cable or display port adaptor? Cables sometimes quit...
Also try a differen hdmi port on your tv. Just to rule out hardware problems.

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