How can I fix my Magnovox T.V?

It is a Magnovox Color T.V. I think it is around 32". When you turn it on the picture is fuzzy, blurry and scrambled. After it is on for about a half an hour or so it starts to come in fine. But sometimes it will suddenly turn black and make a clicking noise. I turn if off and then back on. It will then work for a little while before turning black again. How can I fix this.