Thunderbolt display horizontal lines

Hi guys I started up my macbook pro which is connected to my Thunderbolt display and the Thunderbolt display had a whole bunch of horizontal lines on it. I though it may be a dodgy thunderbolt cable so I went and purchased a new one but that had no effect. So I tried unplugging the power for 30 seconds and restarted the macbook, but the lines where still there. So then I left it all connected and running for a few minutes and the lines just disappeared. So i thought it was all good until later on i restarted once again and the lines reappeared. I was just wondering if anyone else has seen these problems in their display and would know what is causing it thanks?

 

Yeah I used the thunderbolt cable I purchased plugged in the other port in the rear of the display, and I just tried it with another macbook pro in the house and the issue still occurred