My early 2008 imac 24" lcd panel starts to flickering and go black, and after a while the screen start up again... for a random of secunds for going to black again. i had try Reset Pram and SMC and rund Apple Hardware test. (No errors) i had also try put a secund monitor into the minidvi and that works. when i take a Flashlight and light into the screen.. i can see graphic. so it not Graphic chip that dead. i try replace the main logic board and that did not help.. still black screen. i try replace LCD Screen and that did not help either. i had also try remove the LCD Temp. cord ... Fan Starts up... but screen still black. what next to try? I think that must be a component that control backlight to turn on/off that fails. but where is that? is that build into the LVDS cable or in the powersupply?