Samsung B550 No Hdmi Signal?

I have signal problems with my samsung b550 lcd tv. nothing that requires a hdmi cable works anymore (blue ray player, dvd player, x box 360). they are not broken, because they can be turned on/off. i upgraded my firmware and bought a new hdmi cable,but still i get no signal. i managed to get my x box to work by using the component cable. so the problem is with the hdmi and i don't know what else to do. any ideas?

Suggestion:

Sometimes the HDMI board dies. And sometimes it's just a glitch. Turn the tv off. Try unplugging the tv from the wall for about 10 minutes. While it's unplugged, remove any HDMI cables attached to it also. After the 10 minutes replug the HDMIs and then the tv. Turn on the HDMI item first, wait about 30 seconds, then turn on the tv. See if the reboot fixes the problem.

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