Display On Boot Up

Periodically, my screen will show a battery of multi-colored horizontal lines about i" by 1/16" all over the screen.
I have to shut the power off completely for about an hour in order to be able to get rid of them and work.
Suggestions?

Hi,
Obviously don't want to shock you here but this is precisely what happened to my original 2004 iMac. I opened the back to find that all the capacitors had burst. It had to go back to Apple and eventually got replaced. Good luck and definitely give Apple a call.
Regards.

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