Unless you've been pulling it in and out, it shouldn't go bad. I assume you've checked to be sure it's properly connected.
HDMI cables should cost less than $20. If you were talked into a $100 cable, you were taken advantage of.
HDMI has a function called HDCP. The TV source and TV have a conversation over it to make sure that only an approved device (your TV) is connected to the cable. This is for copyright protection reasons.
Have you recently connected a new source (cable box, DVD player, whatever)?
Your problem can be in the TV, the cable or the source.
Try substituting for each to determine what's failed.
If you have your TV now hooked-up with component, you may have discovered that there's little or no difference in the picture
someone please help
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