Chosen Solution
Screen just turned like this a week ago.. my other iMac today!! What is wrong? Two on the same week?’ Serial nr. iMac “Core 2 Duo” 3.06 21.5-Inch (Late 2009) W8943ARXB9U Checked the ram without result! Cheers!
This is a graphics card issue. you could find on ebay a remplacement one if is still worth the trouble for this type of iMac.
