Rispondi a "Is it possible to replace only the backlight?"I've had my 27" iMac dissembled... to see if I could find the cause... the cold solder joints. No luck. iMac is from december 2009. Problem occurred aprox 1 1/2 - 2 years from purchase. I've learned to live with the left-corner-dark-spot problem... even though it's annoying. Most of the action on the screen happens on the right side... iTunes in the dark spot - even added a ssd disk and filled it up with ram (one of the ram slots didn't work by the way) - to breathe an extra year of life to my soon ancient iMac. I will however buy a new one probably within the next year... and cross my fingers not running into any dark spots again.