Since my backlight fault, i've been going through forum after forum to find thousands of people are having the same problem with their iMac's - Usually a dull/darker left side of the screen. since i didn't fancy paying Apple £400 for a new LED/LCD (they're not having another penny from me!) i took a look inside and found what the problem was. I am no expert with macs and have never opened one until now, but this is pretty credible evidence to show what is causing at least MY problem with my backlight as well as others. Thanks for watching, i hope this helped. Subscribe if it did! :)
Billy.