Why do purple lines appear when I connect my macbook to my Dell U2412M moniter?

So I got my Thunderbolt to HDMI cable today and I tried plugging it in. The display comes up clear and then slowly degrades with more and more horizontal purple lines. I've never seen anything like it. The display is basically useless within 30 seconds. I tried rebooting my Macbook, restarted my monitor, I tried the adapter with a couple of other monitors and TVs and it worked fine. I tried my monitor with another macbook and my xbox but the HDMI worked. I have no idea what to do anymore.
Macbook Pro 13.3 in Mid 2012 Core i5 8 gigs RAM Samsung 840 EVO 250gb SSD and Mavricks 10.9.4

Hi Jake,
It's impossible to know without troubleshooting, but it sure sounds like a bad adapter or cable.

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Why do purple lines appear when I connect my macbook to my Dell U2412M moniter?

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