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Colorful lines usually represent video problems. You will need to take your iMac to an Apple certified repair store to have it fixed. It's an advanced job that can only be done with the help of special equipment.
Good luck.
Tech from
You have a bad driver. Reinstall your screen driver or clear your P ram by holding the letters P and R and the control button when you boot your laptop. Hold them until it chimes and reboots.
Uh-Oh.. Sounds like the BGA RAM in the video circuit. (These units are Intel based and Core 2 duo if posted correct).. We can repair if you need help and its under warranty and sorry its not a home remedy situation..
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