My iMac restarts repeadly and shows yellow ~ all over the screen

My iMac restarts itself over and over I believe it is a kernel panic.It shows yellow,blue, and green ~ on every startup. Are there commands in the (Command+S) that will help me. All keys don't work on startup. I cannot do anything on it beside access (Command+S) on accasions.

If it was just restarting, this may have been software but since there is visible screen distortion, im thinking this is most likely a logicboard on its way out.    Definately take this to an apple store and have them diagnose and repair the machine.

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