Instruction: Generate an answer to the question by utilizing the information contained in the document.

Input:
Question: we have two 3 to 4 yr-old macbook pro's - we have TVs with hdmi port - why are people saying this doesn't work for long?
Document: I tried hooking it up, the laptop connected but the tv couldn't connect. It kept saying no signal. I tried using other ports but still had no luck.Too bad my old hdmi cable doesnt fit on my new laptop.
When I first tried this cable I put it on HDMi 3 and my TV kept flashing my background only, so I thought didn't work. I then decided to try my HDMi 1 on my TV and it worked perfectly! I Highly recommend this product!
Im upset with this cord.. it worked fine for the first two weeks.. then it started going in and out... it does not work for tvs larger than a 26 inch
This works great connection is clear and sound is great. Took longer than I'd like for delivery but worth the 3-4 weeks
This cable was purchased to connect my MacBook Pro to my television to run a slide show. Worked beautifully. I did have one misconception, however. I assumed that since I was attaching an HDMI cable to the television that I would get both video and audio on the television. (Yes, it was a stupid assumption, but give me a break; I'm 70 years old.) I discovered that display port on the MacBook Pro, is just that -- a display port. Video only; no audio.
This item does not work for very long. It lasted for about two weeks. You might as well just buy one from apple.
Great and affordable product, I recommend it for anyone with a Macbook Pro that has the Mini Display Port. It's nice that it's 10 feet long too.
Very good. It's effective. It's long enough. It's affordable, needs no adapter. It serves it's purpose. I have just used it for two weeks and it's working well. Hope it continues to work well. I highly recommend it.
I ordered this cord to steam movies from my laptop to my computer and I received my order in about 3 or 4 days, when expected. It came in great condition, however I purchased the wrong cord. The seller was very understanding and was great with communication. I would definitely order from this again.
broke after 3 and 1/2 weeks of use i did not once remove the hdmi from the tv i only removed the thunderbolt when i needed mobility... anyway the encasing for the hdmi came loose and started to slide so that once it malfunctioned and i tried to secure the connection, i could not reconnect it to the tv at all because it would slide up to cover the hdmi connector, ill keep trying tho... or buy a different brand.
Answer: because the hdmi ports have metal prongs on both side and the more you use it the more wore out it gets eventually making it poor and hard to use properly